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2. Andradite - Wikipedia

   en.wikipedia.org/wiki/Andradite

   Andradite is a mineral species of the garnet group.It is a nesosilicate, with formula Ca 3 Fe 2 Si 3 O 12.. Andradite includes three varieties: Colophonite: a historical variety found in the Scandinavian islands, brownish or reddish in color, often opaque or translucent.

3. Doublet (lapidary) - Wikipedia

   en.wikipedia.org/wiki/Doublet_(lapidary)

   Opal Doublet. A garnet and glass doublet uses a top portion of natural garnet fused to any color of glass to imitate a gem. The color of glass used in the doublet is all that is seen, as the garnet provides no color. If seen in reflected light, a separation line may be seen. A harder garnet makes the stones more durable.

4. Rhodolite - Wikipedia

   en.wikipedia.org/wiki/Rhodolite

   The color of rhodolites, combined with their brilliance, durability, and the accessibility of stones with no visible inclusions have brought about some demand for the stone in the jewelry industry. Rhodolites used in jewelry are generally faceted to make good use of their brilliance, though they also exist in cabochon form.

5. Garnet - Wikipedia

   en.wikipedia.org/wiki/Garnet

   A sample showing the deep red color garnet can exhibit. Garnet species are found in every colour, with reddish shades most common. Blue garnets are the rarest and were first reported in the 1990s. [7] [8] [9] [10]

6. Tsavorite - Wikipedia

   en.wikipedia.org/wiki/Tsavorite

   A crystal that yielded a 120.68-carat (24.136 g) oval mixed-cut gem was also uncovered in early 2006. [7] The Lion of Merelani is a square cushion cut tsavorite that weighs 116.76 carats and has 177 facets.

7. List of gemstones by species - Wikipedia

   en.wikipedia.org/wiki/List_of_gemstones_by_species

   Calcite. Manganoan calcite (var.); Caledonite; Canasite; Cancrinite. Vishnevite; Carletonite; Carnallite; Cassiterite; Catapleiite; Cavansite; Celestite; Ceruleite ...