Diamond Eternity Rings

diamond eternity ringsA diamond eternity ring features diamonds of the same shape and size in a continuous circle around the band offering an unsurpassed amount of brilliance, fire, and sparkle from every angle.

Eternity bands are simplistic and elegant.  They can be worn alone or are a great compliment to an engagement ring.  Diamond eternity rings can be purchased as an original wedding band or an anniversary band.   Diamond eternity rings make a great gift for that special milestone anniversary.  The traditional eternity ring contains all diamonds, but some contain diamonds with alternating gemstones or just gemstones.

Diamond Eternity Ring Designs

The most popular eternity ring design is the open basket shared prong design.  In an open basket design the diamonds are set at the same height allowing light to enter and flow through all the stones evenly.  The shared prongs allow the diamonds to be set using the least amount of metal possible, so all you see is the brilliance and fire of the stones.

Another popular eternity ring design is a channel set.  This setting allows for the diamonds to be set within the band providing a smooth surface.  Since light enters and exists through the table of the diamond this setting offers brilliance and fire with a more tailored look.

What diamond shapes are used and why?

The most popular diamond shape used for eternity rings is the round brilliant followed closely by the princess cut and radiant cut.  These shapes are known for their brilliance and fire and can be set very close together making them the perfect shape for any style eternity ring.    Over the past several years, asscher and emerald cuts have gained popularity and provide a very classic elegant look.

What diamond color and clarity is recommended and why?

For diamond eternity rings we recommend colorless or near colorless diamonds with a clarity rating of SI1 or better for round brilliant cut, princess cut, and radiant cut diamonds.  For asscher cut and emerald cut eternity rings we recommend colorless diamonds with a clarity rating of VS2 or better.

At Since 1910 we take pride in offering something unique in the way of eternity rings….our custom eternity rings builder. Our custom eternity ring builder offers you the opportunity to build your own eternity ring custom made to your exact finger size in three easy steps; choose your diamond shape, choose your finger size, and choose your diamond color and clarity.   This is a great benefit to you because you only pay for the exact number of diamonds used.  When purchasing a pre-made eternity ring often times it will need to be sized down, but you will still be paying the original price regardless.


Simon G Split Shank California Dreaming Diamond Ring

This stunning Simon G engagement ring features a 18kt rose gold split shank with natural pink pave set diamonds.   It also features two kite shaped bezel set diamonds as well as round brilliant cut pave set diamonds down the band.  This setting is available in platinum, 18kt white gold, 18kt yellow gold, and 18kt rose gold and can accommodate a round brilliant cut or fancy shape center stone from .70ct t0 4.20ct.

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Understanding the Many Shapes of Diamonds

With so many diamond shapes available on the market today, how do you know which one is right for you?  Each diamond shape offers something a little different. The round brilliant cut and the princess cut offer the most sparkle and fire while the emerald cut offers a classic elegant look.

Here is a look at the top 10 diamond shapes for engagement rings sold today.

Round Brilliant Cut Diamond

More than 100 years ago, a Russian Mathematician named Marcel Tolkowsky, who was a member of a large powerful diamond family, calculated the number of cuts necessary to create the “ideal” diamond shape, known today as the brilliant cut.  Since that time, cutters have been using advanced techniques and mathematical calculations to intensify brilliance and fire.

The Round Brilliant (aka brilliant cut) shape diamond is the most popular of diamonds shapes.   It consists of 58 facets and displays the most brilliance, fire, and scintillation of all diamond cuts on the market today.

Asscher Shaped Diamond

The Asscher cut diamond was developed in 1902 by the Asscher Brothers of Holland and is a variation of an emerald cut.  The Asscher cut is a stepped square cut also known as a Modified Square Emerald cut.   This cut offers a small table (largest facet on a stone) high crown (top portion of the stone) deep pavilions (lower portion of the stone), and cut corners.   With its 72 wide step facets it resembles that of an octagon and sparkles like the Round Brilliant.   The recommended length to width ratio for this diamond shape is 1.0 – 1.05 which will provide for a square look.

Emerald Shaped Diamond

The “Emerald Cut” was originally developed for cutting Emeralds not diamonds and this is how it received its name.  The Emerald cut provides for a very elegant classic look and is known for its long lines.   The pavilion (bottom portion of the stone) is cut with large facets to create an optical appearance and because of this clarity, cut, and color are very important factors when considering this cut.  The recommended length to width ratio for this diamond shape is 1.30 – 1.40.

Cushion Shaped Diamond

The Cushion cut diamond is unique with its rounded corners and larger facets and is also known as a pillow cut or candlelight diamond.  The Cushion cut is an antique cut that is a cross between the Old Mine Cut popular in the late 19th Century, early 20th Century and an Oval cut diamond.   This cut provides for a classic look and is not as brilliant as the more modern cut diamonds.  The Cushion has large open facets so clarity and color are important factors when considering this cut.  The recommended length to width ratio for this diamond shape is 1.25 – 1.30.   A ratio between 1.0 – 1.05 offers a square look whereas a ratio greater would offer a more rectangular look.

Heart Shaped Diamond

The Heart shaped diamond is known as the most romantic of all diamond cuts.  The Heart is essentially a Pear shaped diamond with a cleft.   This cut is very distinctive and is beautiful when set.   Symmetry and length to width ratio are very important factors to consider when purchasing this shape.   The recommended length to width ratio for the perfect heart shape is between .90 – 1.10.

Marquise Shaped Diamond

The Marquise cut resembles the shape of a football or classic style boat when viewed from above.  The cutting method used for a Marquise is a “step cut” also known as a “table cut.”  The facets on a “step cut” are cut in steps.  The crown (top portion of the stone above the girdle), pavilion (bottom portion of the stone below the girdle), and table (largest facet on a stone) are cut in rectangular facets.  The Marquise is bright, clear, and has a great deal of sparkle because the facets span the length or width of the stone and decrease, as they get closer to the table.

Oval Shaped Diamond

The Oval is a brilliant cut and is an adaptation of the Round Brilliant.  With its 56 facets it usually looks larger than a round stone of the same carat weight.  It is a great alternative for someone wanting the look of the Round Brilliant, but also looking for something a little different.  The Oval is a classic choice and flatters the shape of the hand as the length of the Oval accentuates long slender fingers.

Pear Shaped Diamond

The Pear is a brilliant cut diamond and is half Oval and half Marquise.  The Pear resembles that of a tear drop pointed at one end and rounded on the other.  An ideal Pear cut has 58 facets offering a display of brilliance and fire.  The Pear is unique and is a great alternative to the round brilliant.

Princess Shaped Diamond

The Princess has sharp uncut pointed corners and with 58 facets are known for their brilliance and fire.  There is no other rectangular or square shaped stone that comes close to the Princess in terms of brilliance.

Radiant Shaped Diamond

The Radiant has the brilliance and fire of the traditional Round Brilliant, but the shape of the Emerald and Asscher cuts.  The Radiant was designed with 70 facets for the maximum amount of brilliance.  It has cropped corners and is often slightly more rectangular over square shaped.

To learn more about diamond shapes and our recommendations for each, visit our diamond shape education section

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Understanding Diamond Proportions: Round Brilliant Cut Diamonds

A diamond’s proportions and their relationship to each other primarily influence the GIA cut grade assigned.  Grading the cut of a polished diamond begins with accessing brightness, fire, and scintillation.  Every proportion of a round brilliant contributes to its interaction with light.  If one proportion is “off” even slightly, a diamond could receive a lower cut grade.  To understand cut grade it is important to know how proportions are evaluated and their relationships to one another.

Grading Proportions – Crown, Table, and Girdle

(Diamonds are always measured in millimeters)

Average Girdle Diameter

Determining average girdle diameter is the first step in evaluating proportions and is the starting point for comparing the diamond’s other proportions.  To determine average girdle diameter, measurements are taken from one edge of the girdle to the other across the diamond in several locations.   Since no diamond is completely round it is necessary to take several measurements.

Total Depth Percentage

Total depth percentage determines why a diamond is underweight or overweight in relation to its diameter.   After obtaining the diamond’s average girdle diameter the total depth percentage can be calculated.  To determine total depth percentage the diamond is measured from table to culet.

Table Facet and Table Percentage

The largest cut facet on a diamond is the table.   The table facet along with the other facets allows light to enter and exit a diamond.  The size of the table facet is an important factor when determining proportions.  Table size is stated as table percentage, which is a percentage of the diamond’s average girdle diameter.

Star Facet and Star Facet Length Percentage

Star facets extend from the edge of the table toward the girdle.  They are very important to consider when evaluating a diamond’s proportions in relation to the rest of the crown as they affect both brightness and fire.

Crown Angle and Crown Height Percentage

Crown angle and crown height percentage are the two crown proportions that affect the diamond’s appearance.   Crown angle is the angle formed by the bezel facets and the girdle plane while the crown angle height percentage is the distance from the girdle plane to the table expressed as a percentage of the average girdle diameter.

The Girdle

The Girdle of a diamond basically prevents damage and provides an “edge” for setting the stone.  A girdle can be bruted, polished, or faceted.  Girdles should be thick enough to prevent chipping, but not too thick where it adds extra weight to the diamond.  Thicker unpolished girdles can created a grayish reflection in the stone which can be unattractive and a girdle that is too thin can create durability problems as well as issues when setting.

Grading Proportions – Pavilion, Culet, and Finish

The Pavilion

The pavilion facets take the light that enters through the crown and reflect it back giving the diamond its brightness.  The pavilion also takes the light and breaks it up into spectral colors known as fire.

Pavilion dimensions are known as pavilion depth percentage and pavilion angle.   The pavilion depth percentage is the distance from the girdle plane to the culet expressed as a percentage of the average girdle diameter and pavilion angle is the angle formed by the pavilion mains and the girdle plane.

Pavilion Depth Percentage

Estimating pavilion depth percentage is done by looking at the reflections seen through the diamond’s table which is most commonly done by rocking the diamond back and forth.   The pavilion facets serve as a mirror reflecting an image to the table.  The reflection should look like a round shape centered on the culet under the table.  It can appear grayish or black in color.  The most common preferred pavilion depth percentage is 43.5%.  Diamonds with a deep depth percentage will appear dark in the center.  Diamonds with a shallow depth percentage will have a grayish ring shape under the table.

Pavilion Angle

Usually, the greater the pavilion depth percentage is the steeper the pavilion angle will be.  Pavilion angles that are very shallow (less than 37.4 degrees) or very steep (more than 44.0 degrees) will have negative effect on a diamond’s appearance.  Steep angles will create a dark area under the table while shallow angles will create an unpleasant reflection under the table.


The culet is a facet located on the bottom of a diamond parallel to the table and its purpose is to prevent chipping on loose diamonds.  The diamond’s culet should be just big enough to prevent chipping, but if it is too large it will appear as a black spot through the table.   Not all diamonds will have a culet.

To learn more about the grading proportions of a round brilliant, click here

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Buyers Guide: How To Purchase Diamonds

Buying a diamond should be a great experience and one that is not confusing or overwhelming.  Like any other large purchase you make, education and knowledge is key.  Before purchasing your diamond make sure you have at least a basic understanding of the 4Cs, diamond shapes, diamond terminology, and what to look for on a diamond grading report.  This will prepare you to ask the right questions and will give you the confidence that the decision you make is the right one for you.

The 4Cs of Diamonds: Cut, Clarity, Carat Weight, Color

Diamond Cut

Of the 4Cs, Gemologists believe that cut has the greatest influence on a diamond’s beauty.  Cut is the factor that determines the diamond’s fire, sparkle, and brilliance.   Diamonds have a unique ability to effectively manipulate light.  This unique quality can only be realized with an extremely high level of accuracy during the cutting and polishing process.  Where nature dictates the uniqueness of color and clarity, humans affect the cut.  While cutting diamond rough, cutters must not only consider the proportions of a diamond, but also the craftsmanship of overall symmetry and polish as well.

A diamond’s brilliance comes from light entering the crown and reflecting from one facet to another and returning back out the crown.  A diamond that is cut too shallow or too deep will not reflect light properly and the diamond will not be as brilliant as a diamond with an excellent cut.

Diamond Clarity

Clarity refers to the absence of clarity characteristics in the diamond. The GIA clarity scale consists of 11 grades ranging from flawless to included.  When determining a diamond’s clarity grade, GIA considers the size, nature, color, position, and quantity of clarity characteristics under 10x magnification.  The lesser the number of inclusions or blemishes a diamond has the higher clarity grade it will receive.  A diamond with no inclusions using 10x magnification will be considered flawless and is very rare and more costly.


An inclusion is a clarity characteristic either totally enclosed in a polished diamond, reaching or extending into it from the surface, or one that is caused by treatments or the cutting process.  Note – Inclusions caused by treatments or the cutting process may not always be documented on the diamond certificate.


A blemish or external clarity characteristic is on the surface of the diamond only and can be caused by wear, the cutting process, or may be a result of the diamond’s crystal structure.   Blemishes play a lesser role than inclusions do when determining the clarity grade, but may affect the polish grade.

GIA Clarity Grades

FLFlawless – no blemishes or inclusions under 10x magnification.

IFInternally flawless – no inclusions and only very minor surface blemishes.

VVS1 and VVS2 Very, very slightly included – very, very small microscopic inclusions extremely difficult to see under 10x magnification.

VS1Very slightly included – very small microscopic inclusions difficult to see under 10x magnification.

VS2Very slightly included – very small inclusions somewhat easy to see under 10x magnification.  These diamonds represent a good value to someone looking for a high quality diamond, as the very small imperfections do not affect the beauty of the diamond.

SI1Slightly included – small inclusions that are easy to see under 10x magnification. This clarity is an excellent choice for someone looking to stay within a budget, but wants a diamond that will look as good as a higher clarity diamond except when viewed under magnification.

SI2 – Slightly included – small inclusions that are visible under 10x magnification. Depending on their location within the diamond, they may sometimes be visible to the unaided eye without magnification.  SI2 diamonds are attractively priced and typically no visible difference can be seen without magnification.  If you are interested in an SI2 diamond and would like us to personally verify if it is eye-clean, please give us a call at 1-800-979-1910.

I1* and I2Included – imperfect with inclusions that are obvious to the unaided eye and may affect the diamond’s durability.

I3*Included – imperfect with inclusions that are extremely obvious to the unaided eye and pose a definite threat to the diamond’s durability.

*At Since1910.com, we do not sell I1, I2, and I3 clarity diamonds.

Diamond Carat Weight

Carat weight refers to the size of the diamond.  Carat is the standard term used for the weight of a diamond and received its name from the seed of a carob tree.  The carob seeds were used by early diamond traders on scales as units of weight for small amounts of diamonds because of their consistent size.  The weight of the carob seed was 200 milligrams and the weight of a carat is exactly 200 milligrams or as it is know today, 0.2 grams

Many believe that the term carat represents the size of the diamond however; carat represents the weight of a diamond.  One carat is divided into 100 points.  So, for example, a quarter carat or 25 point diamond weights .25 carats (cts).   Diamonds weighing over one carat are expressed as carats and decimals.   They are measured to the hundred thousandths of a carat and rounded to a hundredth of a carat.   For example, a 1.25 stone would be described as one point twenty five carats.

The cost of a diamond is not measured in weight alone.   Several diamonds of the same weight can be priced considerable different.  When calculating the cost of any diamond, clarity, cut, and color are major factors as well.

Diamond Color

Color refers to the absence of color in the diamond.  Diamonds composed of pure carbon are colorless and extremely rare and costly.  Most diamonds contain nitrogen, boron, or hydrogen all of which impact color.  A majority of white diamonds sold on the market today contain traces of nitrogen, which causes slight shades of yellow or brown.  Small, subtle differences in color can make a substantial difference in a diamond’s value.

In a effort to eliminate confusion related to diamond color, the Gemological Institute of America (GIA) implemented the color grading system in the 1950s which is still being used industry wide today.   Diamonds are graded on a scale beginning with the letter D (colorless) and ending with Z (light yellow or brown).   When creating the new color scale GIA chose to start with the letter D as a means of starting over.  Prior to GIA implementing the D-Z scale, other systems all of which were inconsistent and inaccurate, already used the letters A-C, numbers 0-3, and the Roman numerals I-III.  It is important to note that diamonds at the end of the color range with a noticeable yellow tinge are not considered fancy yellow color diamonds.

Factors to Consider When Choosing a Diamond Color

  • When a diamond is well cut the diamond’s refraction and dispersion will often disguise certain degrees of color and may make a darker diamond appear whiter when viewed with the unaided eye (without magnification).
  • The size of the diamond will also affect the appearance of its color.  Color can easily be seen in larger diamonds as opposed to smaller diamonds.  Often times it is difficult to see color in diamonds under a 1/2 carat with the unaided eye.
  • The shape of the diamond will affect its color as well particularly step cut diamonds such as the Asscher and Emerald that have large open facets and do not display the brilliance of other cuts.  The center of these diamonds display a “window effect” where some of the color in the diamond can appear washed out and make it appear whiter then its actual color grade.  The shallower the cut of the diamond the more apparent this will be.

Diamond Shapes

Diamond shape is the basic outline of the diamond.   Here are some popular shapes sold today.

Round Brilliant is the most popular.  It consists of 56 to 58 facets and displays the most brilliance, fire, and scintillation of all diamond cuts on the market today.

Asscher is a stepped square cut also known as the modified square emerald cut.  It consists of 72 facets and resembles the shape of an octagon.

Cushion is not as brilliant as many of the more modern cuts, but has a classic romantic look that definitely stands out in a crowd.

Emerald is a cut that provides a very elegant classy look and is known for its long lines.  The pavilion is cut with large rectangular facets to create an open effect or optical appearance.

Heart is known as the most romantic of all shaped diamonds.  The heart consists of 59 facets and is essentially a pear cut with a cleft at the top.

Marquise resembles the shape of a football when viewed from above.  The marquise is bright, clear, and has a great deal of sparkle.

Oval is an adaptation of the round brilliant and usually looks larger than the round brilliant of the same carat weight.

Pear is half oval and half marquise.  The pear has 58 facets and displays the brilliance, fire, and sparkle of the round brilliant.

Princess is square shaped with uncut pointed corners.  The princess has 58 facets and is known for its brilliance, fire, and sparkle.

Radiant has 70 facets and has the brilliance and fire of the round brilliant.  The radiant is square/rectangle in shape with cropped corners.

Diamond Certificates

A diamond certificate (aka – diamond plot, diamond grading report) is a document certifying a diamond is genuine and is created by a group of gemologists after the diamond is carefully evaluated.  The report contains information such as carat weight, color, clarity, proportions, and a cut grade for round diamonds.   The certificate also contains a “blueprint” of the diamond’s clarity characteristics.

To understand all aspects of the diamond grading report, click on the GIA link below:


To understand all aspects of the diamond anatomy, click on the GIA link below:



Diana Solitaire Setting with Pave Accents

This contemporary solitaire Diana engagement ring features four prongs and has round brilliant cut pave-set diamonds going around all 4 sides of the band.  This setting can accommodate a round brilliant or fancy shaped center stone from .40ct to 6.20ct.

diana solitaire ringShop all Since 1910 Diana engagement ring settings to find the perfect one for you

Understanding Diamond Symmetry

The details of a diamond’s cut are referred to as its finish.  Finish is made up of two categories; Symmetry and Polish.  Symmetry is the exactness of the shape and placement of a diamonds facets and polish is the overall condition of the facet surfaces.

Almost all diamonds on the market today have some minor symmetry problems; which are usually not visible to the unaided eye and have very little effect on a diamond’s appearance and beauty.

To evaluate symmetry, gem laboratories consider the evenness of a diamond’s outline and the size, shape, and placement of its facets.  For grading purposes, two types of symmetry are considered; proportion symmetry and facet symmetry.  Proportion symmetry is the alignment and balance of the diamond’s table, culet, girdle, and angles while facet symmetry is the shape, placement, and presence or absence of the facets themselves.  Proportion symmetry and facet symmetry make up the diamond’s symmetry rating.

Before assigning a symmetry grade, GIA and other gem laboratories look for symmetry variations under 10x magnification.  A diamond’s symmetry grade and the abbreviation of the symmetry characteristic are listed on all diamond grading reports.

The GIA symmetry grades are: Excellent (E), Very Good (VG), Good (G), Fair (F), and Poor (P)

The AGS symmetry grades are: Ideal (AGS 0), Excellent (AGS 1), Very Good (AGS 2), Good (AGS 3, 4) Fair (AGS 5, 6, 7), and Poor (AGS 8, 9, 10)

Common Variations in Proportion Symmetry

Crown angle variation (CV)

Culet off-center (C/oc)

Extra facets (EF)

Girdle thickness variation (GTV)

Misalignment of crown and pavilion facets (Aln)

Misshapen facets (Fac)

Missing facet (MF)

Non-pointing (Ptg)

Out-of-round girdle outline (OR)

Pavilion angle variation (PV)

Table off-center (T/oc)

Table/culet alignment (T/C)

Table and girdle not parallel (T/G)

Wavy girdle (WG)

Excellent and Very Good symmetry grades are rare.  Diamonds with a symmetry grade of Good offer exceptional beauty and are the most frequently purchased diamonds today.  Diamonds with a high symmetry grade are more important in diamonds that have very high clarity grades such as flawless or internally flawless than diamonds with a lower clarity grade.  Symmetry is important for both round brilliant cut diamonds as well as fancy cut diamonds.

When budget allows, Since 1910 recommends purchasing a diamond for an engagement ring with a symmetry grade of Good or higher.

To learn more about diamonds, visit our diamond education section.

diamond symmetry chart

Stardust .70ct Micro Pave Split Shank Setting with a Micro Pave Undercarriage

This stunning Stardust engagement ring features 124 round brilliant cut pave set diamonds down all three sides of the split shank.  With its pave undercarriage this setting was perfectly designed to show off your choice of a center stone.  Available in platinum, 18kt white gold or 18kt yellow gold and can accommodate a round brilliant or fancy shaped center stone from .70ct to 4.20ct.

Stardust Micro Pave Split Shank Setting

Shop all Since 1910 Stardust engagement ring settings to find the perfect one for you

Precision Set Common Prong Setting .25ct tw

This classic Precision Set engagement ring features round brilliant cut diamonds around the entire band.  The diamonds are common prong set which allows less metal to be used offering the maximum amount of brilliance from the diamonds.

precision set common prong settingAvailable in platinum, 18kt white gold or 18kt yellow gold and can accommodate a round brilliant or fancy shaped center stone from .40ct to 4.20ct.  Matching wedding band sold separately.

Shop all Since 1910 Precision Set engagement rings to find the perfect one for you!

Art Carved Three Stone Diamond Ring With Floral Carving .37ct tw

This beautiful Art Carved engagement ring features 2 round brilliant cut diamonds on each side of the center stone.  It also features floral engraving along the top of the band which is detailed in diamonds.  Available in palladium, 18kt white gold or 18kt yellow gold and can accommodate a round brilliant or fancy shaped center stone from .40ct to 4.20ct.

Shop all Since 1910 Art Carved engagement rings to find the perfect one for you!