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Asterism on the surface of a blue star sapphire. A purple-pink star sapphire displaying asterism in a platinum ring.. An asterism (from Ancient Greek á¼€στήρ (astḗr) 'star' and -ism) is a star-shaped concentration of light reflected or refracted from a gemstone.
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.
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.
Mineralogist and Tiffany gem expert George Kunz (1856–1932) was commissioned by wealthy financier J. P. Morgan (1837–1913) to acquire an impressive gem collection for an exhibit at the Paris Exposition of 1900; the Star of India was among the stones Kunz procured. [4] The Star of India is a huge blue star sapphire weighing 563.35 carats.
The necklace consists of a single chain of platinum links connected by pairs of round brilliant cut diamonds. The 98.56-carat (19.712 g) table-cut Bismarck Sapphire is mounted in a pendant at the front of the necklace, surrounded by baguette-cut diamonds and eight smaller square-cut sapphires placed symmetrically around the edges of the setting ...
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.
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