This huge yellow diamond is the Grand Duke of Joseph Diamond, named after the last well-known owner, the Grand Duke Joseph Auguste. It weighs 76 carats and has the most striking features of Indian Golconda diamonds, with perfect color and cleanliness. Ian Belf is known as one of the 46 famous diamonds in the world.
On November 13, 2012, Christie's in Geneva sold the diamond at a high price of 20.355 million Swiss francs, or about 134 million yuan, creating the highest global auction record for colorless diamonds per carat. Black diamonds are generally used as collections, and some are used as treasures for jewellery shops. The French jewellery brand "Korean" was launched in 1996 when it was black with a weight of 88 carats. Diamonds attracted the attention of many collectors. In September 1998, at the jewelry exhibition held in Taiwan, the famous "Mengbaoxing" brand also launched a black diamond key chain weighing 64.3 carats.
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