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2. Vladyslav Yavorskyy - Wikipedia

   en.wikipedia.org/wiki/Vladyslav_Yavorskyy

   He possesses the world’s largest and famous cobalt blue spinel from Luc Yen mine in Vietnam, and one of the largest red spinel weighing 110 carat. [14] Yavorskyy is the author of Terra Spinel, a book he privately published and printed in 2010. [15] The book contains images that document some of his spinel finds over the years.

3. Dubai Gold Souk - Wikipedia

   en.wikipedia.org/wiki/Dubai_Gold_Souk

   Dubai Gold Souk or Gold Souk (Arabic: سوق الذهب), is a traditional market (or souk) in Dubai, UAE. The souk is located in Dubai's commercial business district in Deira, in the locality of Al Ras. The souk consists of over 380 retailers, [1] most of whom are jewelry traders. Dubai Gold Souk entrance

4. Spinel - Wikipedia

   en.wikipedia.org/wiki/Spinel

   It is widely used as an inexpensive cut gem in birthstone jewelry for the month of August. Light blue synthetic spinel is a good imitation of aquamarine beryl, and green synthetic spinel is used as an emerald or tourmaline simulant. [29] By 2015, transparent spinel was being made in sheets and other shapes through sintering. [30]

5. Taaffeite - Wikipedia

   en.wikipedia.org/wiki/Taaffeite

   Taaffeite (/ ˈ t ɑː f aɪ t /; BeMgAl 4 O 8) is a mineral, named after its discoverer Richard Taaffe (1898–1967) who found the first sample, a cut and polished gem, in October 1945 in a jeweler's shop in Dublin, Ireland.

6. Ceylonite - Wikipedia

   en.wikipedia.org/wiki/Ceylonite

   The mineral ceylonite has the chemical composition of (Mg, Fe 2+) Al 2 O 4, putting it into a group of minerals known as the spinel group, or the oxide spinels. The oxide spinels have a formula of the model [A][B] 2 O 4; where [A] is commonly Fe 2+, Mg 2+, or Mn 2+, and [B] is Fe 3+, Al 3+, or Cr 3+. It is an iron-rich variety of the spinel ...

7. Diamond simulant - Wikipedia

   en.wikipedia.org/wiki/Diamond_simulant

   Gem-quality material is usually a strong yellow to honey brown, orange, red, or green; its very high RI (2.37) and dispersion (0.156) make for an extremely lustrous and fiery gem, and it is also isotropic. But here again, its low hardness (2.5–4) and perfect dodecahedral cleavage preclude sphalerite's wide use in jewelry.