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2. Move over diamonds, these little-known gemstones are heating up

   www.aol.com/move-over-diamonds-little-known...

   In 2016, jeweler Olivia Young of Ouroboros sold a red spinel ring for £6,000 ($7,700). Last year, the client’s insurance company paid out £30,000 ($38,400) to replace it.

3. French Crown Jewels - Wikipedia

   en.wikipedia.org/wiki/French_Crown_Jewels

   The surviving French Crown Jewels, principally a set of historic crowns, diadems and parures, are mainly on display in the Galerie d'Apollon of the Louvre, France's premier museum and former royal palace, together with the Regent Diamond, the Sancy Diamond and the 105-carat (21.0 g) Côte-de-Bretagne red spinel, carved into the form of a dragon.

4. 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. [1]

5. Timur ruby - Wikipedia

   en.wikipedia.org/wiki/Timur_ruby

   The Timur Ruby (also Khiraj-i-alam, "Tribute to the World") is an unfaceted, 352.54-carat (71 g) polished red spinel set in a necklace. [1] It is named after the ruler Timur, [2] founder of the Timurid Empire and purportedly one of its former owners. It was believed to be a ruby until 1851.

6. Carbuncle (gemstone) - Wikipedia

   en.wikipedia.org/wiki/Carbuncle_(gemstone)

   Carbuncles and their chimeras have spanned three millennia. Intermingling red gems until the time of their crystal-chemical definitions at the end of the 18th century, they united, for commercial purposes, the various sardonyx and carnelian, garnets, ruby and spinel as an intrinsic common quality of their luminous dispersion magnified by artifacts.

7. 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]