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Awesome Trillion Portuguese Cut Paraiba Green Tourmaline loose gem

The Tereschenko Blue Diamond (Терещенко). 42.92 carat, pear-shaped. Its original owners were the Tereschenko's, a family of sugar magnates in pre-communist Russia. In 1915, Mikhail Tereschenko instructed Cartier to mount the gem as the centerpiece of a necklace containing a variety of fancy colored diamonds.