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Gems & Gemology, Winter 2008, Vol. 44, No. 4. Details history and methodology of the GIA color scale. Wise, Richard W. (2016). Secrets of the Gem Trade, the Connoisseur's Guide to Precious Gemstones (Second ed.). Brunswick House Press. pp. 145– 162. ISBN 978-0-9728223-2-9
Gemstone pricing and value are governed by factors and characteristics in the quality of the stone. These characteristics include clarity, rarity, freedom from defects, the beauty of the stone, as well as the demand for such stones. There are different pricing influencers for both colored gemstones, and for diamonds.
Rubellite used to be the most expensive and prized gem in the tourmaline group but has since been eclipsed by the Paraiba tourmaline. [7] [8] The most valuable specimens are colored red and lack brown. [3] Those that are of ruby color are the most valuable. [9]
Emerald is a gemstone and a variety of the mineral beryl (Be 3 Al 2 (SiO 3) 6) colored green by trace amounts of chromium or sometimes vanadium. [2] Beryl has a hardness of 7.5–8 on the Mohs scale . [ 2 ]
Ruby is a pinkish red to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide). Ruby is one of the most popular traditional jewelry gems and is very durable. Other varieties of gem-quality corundum are called sapphires. Ruby is one of the traditional cardinal gems, alongside amethyst, sapphire, emerald, and diamond. [3]
Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases, [1] [2] is an opaque, [3] impure variety of silica, usually red, yellow, brown or green in color; and rarely blue. The common red color is due to iron(III) inclusions. Jasper breaks with a smooth surface and is used for ornamentation or as ...
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