Boucheron Serpent Bohème earring in yellow gold and diamonds

The 4 criteria of evaluation of the diamond are defined by the "4 Cs":

- Cut (its size, i.e. the shape that the cutter has given it by creating facets)

- Clarity (its purity)

- Color (its color, ranging from D exceptional white + to Z tinted)

- Carat (its weight)

Gold 750 ‰, formerly called "18k Gold", is the finest quality of gold that can be found in jewelry. Note: since January 1, 1995, it is mandatory in France to use the concept of thousandths to indicate the purity of gold.

18k yellow gold (750 thousandths) is 75% pure gold, alloyed with other precious metals to make it workable. It is the most beautiful quality of gold that can be found in jewelry.

Slightly domed on one side and pierced with a hole, the Alpa clasp offers maximum security. To open it, pinch two tiny snaps on each side with your thumb and forefinger, and then slide it into the earring's stem up to a notch. When the snaps are released, the disc locks onto the stem and cannot be moved.

Also known as 18k gold.