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Gemstones of the World revised 5th edition, 2013 by Walter Schumann ISBN 978-1454909538 Smithsonian Handbook: Gemstones by Cally Hall, 2nd ed. 2002 ISBN 978-0789489852 v
An article about Harry Winston appeared in the 1983 Spring [8] issue of Gems & Gemology magazine. In the section about the Star of the East, the magazine Stated: The Star of the East is believed to have been originally the Ahmedabad, a 157.25-ct rough diamond purchased in India in the mid-17th century by Tavernier, the French gem merchant.
When discovered in 1905 the 3106.75 carat (621.35 g) Cullinan was the largest rough gem-quality diamond ever found. It was cut into 105 diamonds including the Cullinan I or the Great Star of Africa, 530.2 carats (106.04 g), and the Cullinan II or the Lesser Star of Africa, 317.4 carats (63.48 g), both of which are now part of the British Crown ...
Diamond[ a] is a gemstone formed by cutting a raw diamond. Diamonds are one of the best-known and most sought-after gems, and they have been used as decorative items since ancient times. The hardness of diamond and its high dispersion of light —giving the diamond its characteristic "fire"—make it useful for industrial applications and ...
In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...
Synthetic diamonds for use as gemstones are grown by HPHT [39] or CVD [108] methods, and represented approximately 2% of the gem-quality diamond market as of 2013. [109] However, there are indications that the market share of synthetic jewelry-quality diamonds may grow as advances in technology allow for larger higher-quality synthetic ...
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.
Main menu. Main menu. move to sidebar hide. ... This list of jewellery types is a listing of most types of jewellery made. ... Gemstone Jewelry; Components. Cameo ...