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Fancy colored diamonds and important gemstones led Sotheby’s High Jewelry Sale in Geneva, though the event’s anticipated star never made it to the block. The Glowing Rose—a 10.08-carat cushion-shaped ...

Forbes contributors publish independent expert analyses and insights. Kate Matthams Spencer is a Paris-based writer who covers jewelry. The Mediterranean Blue diamond became the highest-value diamond ...

An “ultra-rare” purple-pink diamond sold for a record 24.4 million Swiss francs ($26.6 million) at an auction in Geneva on Wednesday evening. The 14.83-carat stone, dubbed “The Spirit of the Rose,” is ...