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Leaders of states in the U.S. which have significant mineral deposits often create a state mineral, rock, stone or gemstone to promote interest in their natural resources, history, tourism, etc. Not every state has an official state mineral, rock, stone and/or gemstone, however. In the chart below, a year which is listed within parentheses represents the year during which that mineral, rock ...
The Star of Bombay is a 182- carat (36.4-g) cabochon -cut star sapphire originating in Sri Lanka. The violet-blue gem was given to silent film actress Mary Pickford by her husband, Douglas Fairbanks. She bequeathed it to the Smithsonian Institution.
Gemstone. Group of precious and semiprecious stones—both uncut and faceted—including (clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster. A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or ...
The Gemological Institute of America (GIA) is a nonprofit institute based in Carlsbad, California. It is dedicated to research and education in the field of gemology and the jewelry arts. [1] Founded in 1931, GIA's mission is to protect buyers and sellers of gemstones by setting and maintaining the standards used to evaluate gemstone quality. The institute does so through research, gem ...
"Yogo sapphire" is the preferred term for gems found in the Yogo Gulch, whereas "Montana sapphire" generally refers to gems found in other Montana locations. More gem-quality sapphires are produced in Montana than anywhere else in North America.
Hiddenite. Hiddenite is a pale-to-emerald green variety of spodumene that is sometimes used as a gemstone. The first specimens of the hiddenite variety of spodumene were recovered circa 1879 near the settlement of White Plains, west of Stony Point, Alexander County, North Carolina. According to contemporary accounts, a man named Lackey brought ...
Gemological Science International, or GSI, is an independent gemological organization that is one of the largest gemological entities in the world, with offices in four continents. [1][2][3] Founded in New York City in 2005 by Mark Gershburg and Debbie Azar, [4][5][6][7] GSI's laboratory division provides diamond and gemstone grading and identification services as well as gemological research ...
Amethyst is a violet variety of quartz, often used in jewelry and has been valued for its beauty and purported healing properties.
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