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2. 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]

3. 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.

4. Chelsea filter - Wikipedia

   en.wikipedia.org/wiki/Chelsea_filter

   However, although this filter is unable to predictably discriminate between natural and synthetic emerald, it has been subsequently found capable of distinguishing aquamarine, blue topaz, and their blue synthetic spinel simulants, because unlike natural gemstones, blue cobalt-containing synthetic spinels emit a red fluorescence under white light.

5. Spinel group - Wikipedia

   en.wikipedia.org/wiki/Spinel_group

   Cobalt spinels: Manganesecobaltite: Mn 1.5 Co 1.5 O 4 [8] Vanadium spinels: Coulsonite: FeV 2 O 4; Magnesiocoulsonite: MgV 2 O 4; Others with the spinel structure: Ringwoodite: (Mg,Fe) 2 SiO 4, an abundant olivine polymorph within the Earth's mantle from about 520 to 660 km depth, and a rare mineral in meteorites; Musgravite: Be(Mg,Fe,Zn) 2 Al ...

6. List of individual gemstones - Wikipedia

   en.wikipedia.org/wiki/List_of_individual_gemstones

   Samarian Spinel, the world's largest spinel; Menshikov Ruby, the world's second largest spinel set on top of the Great Imperial Crown of Russia; Timur Ruby, believed to be a ruby until 1851, hence its name; Black Prince's Ruby, the famous spinel mounted on the Imperial State Crown of the United Kingdom

7. Black Prince's Ruby - Wikipedia

   en.wikipedia.org/wiki/Black_Prince's_Ruby

   The gemstone at the front of the Imperial State Crown. The Black Prince's Ruby is a large, irregular cabochon red spinel weighing 170 carats (34 g) set in the cross pattée above the Cullinan II diamond at the front of the Imperial State Crown of the United Kingdom.