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The mineral or gemstone chrysoberyl is an aluminate of beryllium with the formula Be Al 2 O 4. [5] [6] The name chrysoberyl is derived from the Greek words χρυσός chrysos and βήρυλλος beryllos, meaning "a gold-white spar".
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 polished, is used to ...
Pure crystals of garnet are still used as gemstones. The gemstone varieties occur in shades of green, red, yellow, and orange. [54] In the United States it is known as the birthstone for January. [2] [55] [56] It is also the birthstone of Aquarius and Capricorn in tropical astrology. [57] [58] The garnet family is one of the most complex in the ...
It is the birth stone of March. [5] Aquamarine is a fairly common gemstone, [6] rendering it more accessible for purchase, compared to other gems in the beryl family. [7] Overall, its value is determined by weight, color, [5] cut, and clarity. [8] It is transparent to translucent and possesses a hexagonal crystal system. [9]
An asterism (from Ancient Greek ἀστήρ (astḗr) 'star' and -ism) is a star-shaped concentration of light reflected or refracted from a gemstone. It can appear when a suitable stone is cut en cabochon (i.e. shaped and polished, not faceted). A gemstone that exhibits this effect is called a star stone or asteria.
Gem and specimen tourmaline is mined chiefly in Brazil and many parts of Africa, including Tanzania, Nigeria, Kenya, Madagascar, Mozambique, Malawi, and Namibia. It is also mined in Asia , notably in Pakistan , Afghanistan , and Indonesia as well as in Sri Lanka and India , [ 25 ] where some placer material suitable for gem use is found.
Bahia Emerald [2]; Carolina Emperor, [3] [4] 310 carats uncut, 64.8 carats cut; discovered in the United States in 2009, resides in the North Carolina Museum of Natural Sciences, Raleigh, NC, US
GemStone systems serve as mission-critical applications. [5] GemStone frameworks still see some interest for web services and service-oriented architectures. GemStone is an advanced Smalltalk platform for developing, deploying, and managing scalable, high-performance, multi-tier applications based on business objects.