What is a Diamond Inclusion?

A diamond inclusion is a clarity characteristic that is completely enclosed within the diamond or extends into it from the surface.  Some people think of inclusions as “flaws” or “imperfections,” but since no two diamonds have like inclusions, think of them as what makes the diamond you choose special and unique only to you.  Take the time to get to know your diamond and you’ll see how truly unique and “perfect” it is.  Flawless diamonds are rare and costly, so most of the diamonds on the market today do have inclusions.  Many do not impact the beauty of the stone, but there are some that will affect the brilliance or durability of the diamond.

Some of the more common inclusions…

Bearding is tiny hairline cracks alone the girdle of the diamond.

Cavities are large crevices or holes where the diamond is missing.

Crystals are minerals and other diamonds that form within the diamond.  They come in a variety of colors, shapes, and sizes.  Many minute crystals that look like tiny specks under 10x magnification are called pinpoints.  Crystals can lower the clarity grade of a diamond, but collectors also seek after them looking for that very unique mineral.   The most common crystal colors are white and black.  Black crystals are often referred to as “carbon spots,” which is an inaccurate term.

Cleavage is a straight flat crack.  A cleavage may split the diamond apart along the length if hit in just the right spot.

Clouds are hazy or milky looking areas within the diamond.  Most clouds are made up of tiny crystals too small to be seen alone under 10x magnification.  Clouds can often times be difficult to find, but when they are large and dense they make the diamond appear white.

Feathers are cracks within the diamond that look exactly like their name, feathers.   Small feathers don’t usually affect the durability of the diamond unless they reach the surface of the stone.

Growth and grain lines are fine lines caused by irregular crystallization that may make the diamond look oily or hazy.  Colorless growth or grain lines usually don’t affect the diamonds clarity grade unless there is a large amount present, but may affect the diamond’s brilliance.   White and colored lines will affect the diamond’s clarity grade.

Knots are included crystals left exposed on the surface by polishing.  They look like bumps on the diamond.

Pinpoints are tiny crystals that look like small specks under 10x magnification that can either appear alone or in groups.  When grouped together they can make a diamond look hazy.

Learn more about the 4C’s