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2. List of U.S. state minerals, rocks, stones and gemstones

   en.wikipedia.org/wiki/List_of_U.S._state...

   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 ...

3. International Silver Company - Wikipedia

   en.wikipedia.org/wiki/International_Silver_Company

   International Silver Company, General Office, Meriden, Connecticut. The International Silver Company (1898–1983, stopped making silver), later known as Insilco Corporation[ 2] and also known as the ISC, was formed in Meriden, Connecticut as a corporation banding together many existing silver companies in the immediate area and beyond.

4. Gemological Institute of America - Wikipedia

   en.wikipedia.org/wiki/Gemological_Institute_of...

   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.

5. Diamond (gemstone) - Wikipedia

   en.wikipedia.org/wiki/Diamond_(gemstone)

   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 ...

6. Cullinan Diamond - Wikipedia

   en.wikipedia.org/wiki/Cullinan_Diamond

   Cullinan Diamond. The Cullinan Diamond is the largest gem-quality rough diamond ever found, [ 2] weighing 3,106 carats (621.20 g), discovered at the Premier No.2 mine in Cullinan, South Africa, on 26 January 1905. It was named after Thomas Cullinan, the owner of the mine. In April 1905, it was put on sale in London, but despite considerable ...

7. Graff (jewellers) - Wikipedia

   en.wikipedia.org/wiki/Graff_(jewellers)

   Graff Diamonds International Ltd. Graff is a British multinational jeweller based in London. [ 1] It was founded by British jeweller Laurence Graff in 1960. A vertically integrated company, Graff operations comprise the design, manufacture and retail distribution of jewellery and watches.

8. List of gemstones by species - Wikipedia

   en.wikipedia.org/wiki/List_of_gemstones_by_species

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9. Gemological Science International - Wikipedia

   en.wikipedia.org/wiki/Gemological_Science...

   New York City. , New York. , United States. Website. www .gemscience .net. 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]