Prices for the rarest stones from Rio Tinto’s defunct Australian mine have long outperformed mainstream investments ...
A rare pink diamond has sold for HK$453.2 million (US$57.7 million) in Hong Kong, setting a record for price per carat paid at auction for any diamond or gemstone, according to Sotheby’s auction ...
A 17.97-carat Burmese ruby ring, estimated to sell for $5.5M, will be a highlight at The Geneva Jewels Auction: Three on ...
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