carat clarity cut proportions shapes colour profile our store buying diamonds terms and conditions register with us email a friend contact us CARAT The Carat size is the unit of weight for all gemstones. One carat is sub-divided into 100 "points". So a diamond weighing 50 points is 1/2 carat in weight, or 0.5ct. There are five carats in a gram.                  rings necklaces bracelets earrings cufflinks