
In the centuries-long process in which pure carbon is transformed into diamond under extreme heat and pressure, other elements can slip into the stone. These foreign elements thus create unique markings either inside the diamond (inclusions) or on the surface of the diamond (blemishes).

Inclusions can range from tiny traces, barely visible, to larger flaws. The fewer inclusions a diamond has, the higher its value.

Every diamond is unique, and no stone is perfect when examined under a 10x magnification, although some stones come close to perfection.
A diamond that shows no imperfections, also called “eye-clean,” is extremely rare. This explains why a smaller, eye-clean stone can be significantly more valuable than a larger but flawed stone. Impurities in diamonds are often not visible to the naked eye. A loupe is used to detect them.


Read more about carat

Read more about color

Read more about the cut

The properties of a diamond
GASSAN adds a fifth C to this standard list: the C for Confidence. This way, with every diamond, you receive an internationally guaranteed certificate.