Tanzanite (Blue Zoisite) - An unheated pink zoisite would be extraordinary
Tanzanite (Blue Zoisite) Hardness: 6.5 Ca2Al3(SiO4)3(OH) 硬度: 6.5 化学成分: Ca2Al3(SiO4)3(OH) Tanzanite, a relatively new gem but has already...
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Caratell
- May 6, 2020
- 3 min
Demantoid Garnet – A highly esteemed garnet with adamantine lustre and amazing ‘horsetail’ inclusion
Hardness 6.5-7 Ca3Fe2(SiO4)3 硬度: 6.5-7 化学成分:Ca3Fe2(SiO4)3 Most people would go for a gemstone that has the least flaws or at least an...
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Caratell
- Apr 24, 2020
- 2 min
The Truth about Imperial Jadeite
Like Diamonds, the evaluation of Jadeite is based upon four important criteria: Colour is the top contributing aspect in a piece of jade....
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Caratell
- Apr 24, 2020
- 3 min
Imperial Topaz - The most highly prized in the Topaz family
Al2SiO4(F,OH)2 Hardness of 8 化学成分：Al2SiO4(F,OH)2 宝石硬度：8 Although topazes exist in a wide range of colours, when the word "Topaz" is...
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Caratell
- Apr 24, 2020
- 2 min
Benitoite - Top 10 Rarest Gems
Chemical Composition: BaTiSi3O9 Hardness 6-6.5 化学成分：BaTiSi3O9 硬度6-6.5 Benitoite is an extremely rare blue barium titanium cyclosilicate,...
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Caratell
- Apr 23, 2020
- 2 min
Bixbite - Red Beryl trade call Red Emerald, one of ten rarest gemstones on Earth
Caratell is proud to present this extremely clean and rare of the rarest gems
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