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Sapphire is one of the two gem-varieties of corundum, the other being ruby (defined as corundum in a shade of red). Although blue is the best-known sapphire color, they occur in other colors, including gray and black, and also can be colorless. A pinkish orange variety of sapphire is called padparadscha .
Project Sapphire was a successful 1994 covert operation of the United States government in cooperation with the Kazakhstan government to reduce the threat of nuclear proliferation by removing nuclear material from Kazakhstan as part of the Cooperative Threat Reduction Program, which was authorized by the Soviet Nuclear Threat Reduction Act of 1991.
Rubicon Technology, Inc. is an American company specializing in sapphire crystal growth and large-diameter sapphire technology. Their improvement to the Kyropoulos technology is called "ES2", and was developed in their Illinois-based crystal growth facilities.
The Star of Adam is an oval-shaped blue star sapphire, currently the largest star sapphire in the world. It weighs 1,404.49 carats (280.898 g; 9.9084 oz). 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.
Star of India. The Star of India is a 563.35- carat (112.67 g) star sapphire, one of the largest such gems in the world. [1] [a] It is almost flawless and is unusual in that it has stars on both sides of the stone. The greyish-blue gem was mined in Sri Lanka [3] and is housed in the American Museum of Natural History in New York City .
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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 Sir 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 ...
Sapphirine. Sapphirine is a rare mineral, a silicate of magnesium and aluminium, with the chemical formula ( Mg, Al)8(Al, Si)6 O 20 (with iron as a major impurity). Named for its sapphire -like colour, sapphirine is primarily of interest to researchers and collectors: well-formed crystals are treasured and occasionally cut into gemstones.