The third “C” you have to think about when buying a ring is Clarity.
Clarity is a measure of imperfections–imperfections on the surface of the stone (known as “blemishes”) and in its interior. In the lingo of the diamond business, these interior imperfections are called “inclusions.”
In real life, inclusiveness is a good thing. Everyone wants to be included.
But diamonds are like the mean girls in high school: their power rests on their exclusiveness. Inclusions happen when some other element gets mixed into the carbon as it is crystallizing.
Inclusions are a diamond’s enemy, lowering its value—even when the flaw is tiny.
Clarity is a little confusing, because—except in the most extreme cases—it’s not something that can be seen with the naked eye.
You might reasonably ask why, when you are forking over at least two months salary to buy a ring whose effect is 100% visual, should you care about flaws nobody can see?
A valid point, but a useless one. Diamond sellers care about inclusions. Fiancés care about inclusions. Both the person you’re buying from and the person you’re buying for will be looking for inclusions. So you need to care about them.
As we explained in this article, the GIA rates a stone’s clarity from “flawless” to “imperfect.” A professional diamond grader will look at the stone under 10x magnification, and pass judgement according to the following criteria:
Flawless (FL): The cream of the crop. No blemishes or inclusions can be detected.
Internally Flawless (IF): No inclusions, but a few insignificant blemishes.
Included (I1, I2, I3): A trained grader will see these inclusions immediately under magnification. Sometimes they can be seen with the naked eye, and can have a bad effect on the stone’s durability and beauty.
Imperfect: a number of inclusions that are visible without magnification.
You get the idea. Don’t bother memorizing the above categories, just try to remember the takeaway.