Diamond is the hardest and most luminous precious stone. The price of a diamond is calculated according to the 4C criteria: Cut - Carat - Clarity - Color. The weight of a diamond is expressed in carat: 1 carat is equal to 0.20 gram. Pure colourless carbon, in jewellery the diamond is cut into facets to increase its sparkle. In watchmaking it is used to decorate straps, cases, bezels, etc.
Today, the fine watchmaking and fine jewellery's brands purchase diamonds in line with the certification requirements of the Kimberley process and the associated guarantee systems set up to put an end to “war diamond” trade.