Boucheron Mini Ring Quatre Blue Edition necklace in three golds, diamond and blue ceramic

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.

The 4 criteria of evaluation of the diamond are defined in English as the "4 Cs":

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

- Clarity (its purity, defined by the inclusions with which the stone is endowed, visible with a magnifying glass x10)

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

- Carat (its weight)

The "round cut", also called "brilliant cut" is the cut (i.e. the way the stone is cut) considered to be of ideal proportions to maximize brilliance and fire.