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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. 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

  4. Ceylonite - Wikipedia

    en.wikipedia.org/wiki/Ceylonite

    Ceylonite, named for the island of Ceylon, is a ferroan spinel with Mg:Fe from 3:1 and 1:1, and little or no ferric iron. Pleonaste is named from the Greek for 'abundant,' for its many crystal forms, and is distinguished chemically by low Mg:Fe ratios of approximately 1:3. It is sometimes used as a gemstone. [2]

  5. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    This is a list of gemstones, organized by species and types. ... Spinel. Ceylonite (var.) Spodumene. Hiddenite ... Color (beta) Automatic. Light.

  6. 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.

  7. Taaffeite - Wikipedia

    en.wikipedia.org/wiki/Taaffeite

    Most pieces of the gem, prior to Taaffe, had been misidentified as spinel. For many years afterwards, it was known only in a few samples, and it is still one of the rarest gemstone minerals in the world. [6] Since 2002, the International Mineralogical Association-approved name for taaffeite as a mineral is magnesiotaaffeite-2N'2S.

  8. Images of gemstones under a microscope are stunning - AOL

    www.aol.com/news/2015-01-22-images-of-gemstones...

    Creating these gorgeous photos is more than just clicking a button. Sanchez directs light through fiber optics then takes the photo with multiple different points of focus. The final image is a ...

  9. Chrysoberyl - Wikipedia

    en.wikipedia.org/wiki/Chrysoberyl

    Some gemstones falsely described as lab-grown synthetic alexandrite are actually corundum laced with trace elements (e.g., vanadium) or color-change spinel and are not actually chrysoberyl. As a result, they would be more accurately described as simulated alexandrite rather than "synthetic".

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