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Synthetic alexandrite is an artificially grown crystalline variety of chrysoberyl, composed of beryllium aluminum oxide (BeAl 2 O 4). The name is also often used erroneously to describe synthetically-grown corundum that simulates the appearance of alexandrite , but with a different mineral composition.
Tangerine, a bright orange-red produced from about 1933, was part of a trend to darker, more vivid colors. During this time, a Cobalt color called Stiegel Blue was also produced. Alexandrite is the rarest of Heisey colors; it can be a pale blue-green under normal light, but in sunlight or ultraviolet light, it glows with a pink-lavender hue.
Alexandrite in sizes over three carats are very rare. Today, several labs can produce synthetic lab-grown stones with the same chemical and physical properties as natural alexandrite. Several methods can produce flux-grown alexandrite, Czochralski (or pulled) alexandrite, and hydrothermally-produced alexandrite.
24.78-carat (4.956 g) A 24.78-carat Fancy Intense Pink diamond and, until the sale of the Sweet Josephine diamond in November 2015, it was the most expensive jewel ever sold at auction. Previously owned by Harry Winston and an unnamed private collector, and bought by Laurence Graff (November 2010).
Kyawthuite was discovered in the vicinity of Mogok in Myanmar, an area famous for its variety of gemstone minerals. [6]Only one 0.3 gram sample of the naturally occurring form of this mineral is documented, and it is stored and on display at the Natural History Museum of Los Angeles County.
Taaffeite (/ ˈ t ɑː f aɪ t /; BeMgAl 4 O 8) is a mineral, named after its discoverer Richard Taaffe (1898–1967) who found the first sample, a cut and polished gem, in October 1945 in a jeweler's shop in Dublin, Ireland.