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Black star needles are perpendicular (cited above) meaning that the sides are dark. The flat face is a bright gold but loses it as soon as a dome is cut. The Journal of gemmology mentions polysynthetic twinning (parallel lines). The star effect occurs in other sapphire colours and is often translucent.
The star-effect may be also caused by the inclusions of hematite. In black star sapphire hematite needles formed parallel to the faces of the second order prism produce asterism. Some star sapphires from Thailand contain both hematite and rutile needles forming a 12-ray star. Star-stones were formerly regarded with much superstition.
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, it occurs in other colors, including gray and black, and also can be colorless. A pinkish orange variety of sapphire is called padparadscha .
Black. The Black Star of Queensland, also known as the Brimstone of Queensland, named after its nature and place of origin, is a 733-carat (146.6 g) black sapphire, and was the world's largest gem quality star sapphire until The Star of Adam was discovered. The Black Star sapphire is an oval-shaped gemstone cut as a cabochon like all other star ...
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Star of India (gem) 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 .
Blackstar (stylised as ★) [1] is the 26th and final studio album by the English musician David Bowie.Released on 8 January 2016, Bowie's 69th birthday, the album was recorded in secret in New York City with his longtime co-producer Tony Visconti and a group of local jazz musicians: Donny McCaslin, Jason Lindner, Tim Lefebvre and Mark Guiliana.
Sapphire Origin Date Size Cut Color Location Ref Star of Adam: Sri Lanka 2015 1,404.49 carats (280.898 g) Star Blue Anonymous owner Black Star of Queensland: Australia 1938 733 carats (146.6 g) Star Black Anonymous owner Star of India: Sri Lanka 563.4 carats (112.68 g) Star Blue-gray American Museum of Natural History, New York
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