DIAMOND

Brilliant (from the French brillant “brilliant, sparkling”) is a diamond that has been cut into a faceted shape through processing, bringing out its natural brilliance as much as possible. Diamonds are graded according to the "4 C" system: cut (cut), clarity (clarity), color (color) and carat (mass in carats), which allows you to determine how close the stone is to perfection. Not every faceted diamond is a diamond - only one that has a brilliant cut. The main thing in assessing the cut of a stone is its quality: how geometrically accurate and proportional the edges are. The ideal cut is encoded with the letter "A", then - B, C, D - in descending order of quality. In the international system (GIA), the ideal cut is designated as Excellent, and in descending order of quality (Very Good, Good, Fair, Bad). [Source not specified 1530 days]

Clarity is the most [source not specified 1530 days] significant indicator of the quality of diamonds: it is expressed in the presence or absence of stone defects or foreign inclusions; a diamond without flaws is called a pure diamond.

The mass of diamonds is measured in carats: 1 carat is equal to 0.2 grams.

Most diamonds are fluorescent, the ability to glow when exposed to ultraviolet light.