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2. List of gemstones by species - Wikipedia

   en.wikipedia.org/wiki/List_of_gemstones_by_species

   Gadolinite; Gahnite; Gahnospinel; Garnet group: Pyralspite. Almandine; Pyrope; Spessartine; Ugrandite. Andradite. Demantoid; Melanite; Topazolite; Grossular ...

3. Zultanite - Wikipedia

   en.wikipedia.org/wiki/Zultanite

   Zultanite has a hardness of 6.5 to 7. [5] Depending on its light source, zultanite's color varies between a yellowish green, light gold, and purplish pink. [ 1 ] Its color can be pastel green in outdoor light and beige pink in incandescent light.

4. Birthstone - Wikipedia

   en.wikipedia.org/wiki/Birthstone

   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] Britain's National Association of Goldsmiths created its own standardized list of birthstones in 1937. [7]

5. Morganite (gem) - Wikipedia

   en.wikipedia.org/wiki/Morganite_(gem)

   Following the discovery of a new locality for rose beryl in Madagascar in 1910, George Kunz proposed the name morganite at a meeting of the New York Academy of Sciences on 5 December 1910 to honour his friend and customer J.P. Morgan [6] [7] for his financial support for the arts and sciences, and his important gifts of gems to the American Museum of Natural History in New York and to the ...

6. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Spanish emerald and gold pendant at Victoria and Albert Museum Enamelled gold, amethyst, and pearl pendant, about 1880, Pasquale Novissimo (1844–1914), V&A Museum number M.36-1928. Gemstones have no universally accepted grading system. Diamonds are graded using a system developed by the Gemological Institute of America (GIA) in the early ...

7. Ruby - Wikipedia

   en.wikipedia.org/wiki/Ruby

   The 23.1-carat (4.62 g) Burmese ruby, set in a platinum ring with diamonds, was donated by businessman and philanthropist Peter Buck in memory of his late wife Carmen Lúcia. This gemstone displays a richly saturated red color combined with an exceptional transparency. The finely proportioned cut provides vivid red reflections.