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Fine Jewelry University Articles matching: “Asterisk k”
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Fine Jewelry University
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Gem in the Spotlight: Tsavorite Garnet
… with a stunningly vivid green color. It is bright and lively with a high refractive index giving it excellent sparkle and scintillation. Tsavorite is also a very rare gemstone. It is uncommon to find Tsavorite in sizes larger than … faceted stones are below two carats. By some estimates, Tsavorite is around 200 times rarer than the much better known Emerald. Gemology Tsavorite’s rarity and beautiful green color reminds one of the other green garnet called … found primarily in Russia. Tsavorite is 7.5 on the Mohs scale. It is a green grossular garnet with a chemical make-up of CA 3 Al 2 (SiO 4 ) 3 . It has a Refractive Index (RI) of 1.740 and a dispersion index of 0.028. So how did …
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Gem in the Spotlight: Emerald
… on the presence of chromium and vanadium in the crystal structure. Emerald’s Mohs hardness rating is 7.5-8 making it softer than sapphire and harder than amethyst and other quartz varieties. The refractive index of emerald ranges from… inclusions. Sometimes these inclusions are referred to as jardin (the French word for garden) because they look like moss or a garden inside of the stone. These inclusions are tiny fissures, bubbles, or crystals that are visible to …
