This colour comparison set contains 13 1 ct-sized round brilliant cut cubic zirconia. Ranging in colour from N to Z, they are excellent for estimating the colour of diamonds for valuations or to show customers the fine differences in colour between fancy grades. Each colour grade has been laser inscribed on the girdle of the stone for easy identification. The set is supplied with two gemstone holders, perfect for comparing diamonds set in jewellery. Please note: If you require a lab-grade master stone set, you should purchase a natural diamond colour set.