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‘Ocean Dream’ Blue-Green Diamond Sells for Record $17.3 Million at Christie’s Geneva

The result signals strong appetite for ultra-rare colored diamonds among private buyers.

Napoleon’s Waterloo Brooch Sells for More Than 3.5 Million Francs at Sotheby’s Geneva

‘Mellon Blue’ Diamond Sells for 20.5 Million Swiss Francs at Christie’s Geneva

Sotheby’s to Auction Kindred Lubeck’s One-of-a-Kind Rings in Gem Drop Sale Next Week