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  2. Category:Spinel gemstones - Wikipedia

    en.wikipedia.org/wiki/Category:Spinel_gemstones

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  3. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

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  4. List of minerals - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals

    This is a list of minerals which have Wikipedia articles. Minerals are distinguished by various chemical and physical properties. Differences in chemical composition and crystal structure distinguish the various species .

  5. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    When jewelry containing sapphires or rubies is heated, those stones should not be coated with boric acid (which can etch the surface) or any other substance. They do not have to be protected from burning, like a diamond (although the stones do need to be protected from heat stress fracture by immersing the part of the jewelry with stones in the ...

  6. List of jewellery types - Wikipedia

    en.wikipedia.org/wiki/List_of_jewellery_types

    Main menu. Main menu. move to sidebar hide. Navigation Main page; Contents; ... This list of jewellery types is a listing of most types of jewellery made. Hair Ornaments

  7. 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.

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  9. 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]