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American Museum of Natural History, New York [5] Queen Marie of Romania: Sri Lanka 478.68 carats (95.736 g) Cushion Blue Anonymous owner [6] Logan Sapphire: Sri Lanka 422.99 carats (84.598 g) Cushion Blue National Museum of Natural History, Washington [7] Star of Asia: Burma 330 carats (66 g) Star Blue National Museum of Natural History ...
In October 2014, Sotheby's Hong Kong achieved consecutive per-carat price records for Kashmir sapphires – first with the 12.00 carat Cartier sapphire ring at US$193,975 per carat, then with a 17.16 carat sapphire at US$236,404, and again in June 2015 when the per-carat auction record was set at US$240,205. [39]
A 0.43-carat (0.086 g) teardrop-shaped cornflower blue Yogo sapphire. Sapphires are a color variety of corundum, a crystalline form of aluminium oxide (Al 2 O 3). [14] Corundum is one of the hardest minerals, rating 9 on the Mohs scale. [15] Corundum gems of most colors are called sapphires, except for red ones, which are called rubies. [16]
A pure, 1-carat diamond can easily fetch a price in the six digits per gram. Prices can vary dramatically based on color, cut and other factors. Rob Lavinsky / Wikimedia Commons CC-BY-SA 3
Logan Sapphire; Star of Bombay, given to Mary Pickford by Douglas Fairbanks, Sr; Star of India; Stuart Sapphire; Black Star of Queensland; Star of Adam, with a weight of 1,404.49 carats (280.898 g), it is the largest star sapphire in the world. Queen Marie of Romania Sapphire
The Logan Sapphire brooch, National Museum of Natural History, Washington, D.C. The Logan Sapphire is a 422.98-carat (84.596 g) sapphire from Sri Lanka.One of the largest blue faceted sapphires in the world, it was owned by Victor Sassoon and then purchased by M. Robert Guggenheim as a gift for his wife, Rebecca Pollard Guggenheim, who donated the sapphire to the Smithsonian Institution in 1960.