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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. 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.

  4. Category:Spinel gemstones - Wikipedia

    en.wikipedia.org/wiki/Category:Spinel_gemstones

    Pages in category "Spinel gemstones" The following 6 pages are in this category, out of 6 total. This list may not reflect recent changes. ...

  5. 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

  6. Taaffeite - Wikipedia

    en.wikipedia.org/wiki/Taaffeite

    [4] [5] As such, it is the only gemstone to have been initially identified from a faceted stone. 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]

  7. 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. Minerals There ... Spinel. Ceylonite (var.) Spodumene. Hiddenite (var.) Kunzite (var.) Triphane (var ...

  8. Birthstone - Wikipedia

    en.wikipedia.org/wiki/Birthstone

    They also replaced December's lapis with zircon and switched the primary/alternative gems for March. The American Gem Trade Association added tanzanite as a December birthstone in 2002. [5] In 2016, the American Gem Trade Association and Jewelers of America added spinel as an additional birthstone for August. [6]

  9. Samarian spinel - Wikipedia

    en.wikipedia.org/wiki/Samarian_Spinel

    It and a smaller 270-carat (54 g) spinel were captured and taken to Iran by Nader Shah following his 18th-century invasion of India.. The Samarian spinel has a hole in it. According to a diary entry of the court physician to Naser al-Din Shah Qajar, the shah told the physician that the stone once adorned the neck of the biblical golden calf, which the Israelites are said to have made while ...

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