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Sapphires are a precious gemstone, a variety of the mineral corundum, consisting of aluminum oxide (α-Al 2 O 3) with trace amounts of elements such as iron, titanium, chromium, copper, or magnesium. It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors; "parti sapphires" show two or more colors.
This later estimate was acknowledged by insiders as a "low-ball estimate," however. [1] The sapphire's value was later upped by Rahul Kadakia, senior vice president and head of jewelry at Christie's America, to approximately $1 million. [5] [3] It was sold as Lot No. 261, and the auctioneer was François Curiel.
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]
The Star of Adam is an oval-shaped blue star sapphire, currently the largest star sapphire in the world. [1] [2] [3] It weighs 1,404.49 carats (280.898 g; 9.9084 oz). [4]Prior to its discovery in 2015, the Black Star of Queensland, weighing 733 carats (146.6 g), was the largest star sapphire gem in the world.
The Star of Asia is a large, 330 carats (66 g) cabochon-cut star sapphire now in the Smithsonian National Museum of Natural History. It is noted for its significant size and is considered to be one of the largest of its type. Adding to its aesthetic value are its rich blue colour and clear star, formed from three intersecting rutile striations.
The Young's modulus of corundum (sapphire) has been reported by many different sources with values varying between 300 and 500 GPa, but a commonly cited value used for calculations is 345 GPa. [32] The Young's modulus is temperature dependent, and has been reported in the [0001] direction as 435 GPa at 323 K and 386 GPa at 1,273 K. [ 32 ] The ...
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The Millennium Sapphire was showcased at the 2002 Academy Awards, [5] and in 2004 it made an appearance in Seattle at the launch of Princess Cruises' ship, The Sapphire Princess. [6] In 2020, Art Appraiser Pascal Butel, M.S. INALCO appraised the fair market value of the Millennium Sapphire at USD 100,000,000 – USD 150,000,000. [7]