The extremely rare, 10-carat Mediterranean Blue diamond could fetch a whopping $20 million at Sotheby's High Jewelry auction ...

Brazil is currently the leader in overall production of amethyst. This article describes the author's visits to three of Brazil’s most important mining areas: Marabá, Pau d’Arco, and Rio Grande do Sul ...

A fancy vivid 10-carat cushion-modified blue diamond – known as the Mediterranean Blue – will appear at Sotheby’s in Geneva on 13 May. As one of the largest ...

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After hours: March 21 at 7:47:33 PM EDT Loading Chart for STNE ...