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2. Carbuncle (gemstone) - Wikipedia

   en.wikipedia.org/wiki/Carbuncle_(gemstone)

   A polished almandine stone . Carbuncle (/ ˈ k ɑːr b ʌ ŋ k əl /) is another name for a deep red almandine gemstone that has been cut with a smooth, convex face in a method called cabochon. [1] Traditionally, the term referred to any red gemstone, most often a red garnet. [2] Carbuncles and their chimeras have spanned three millennia.

3. Demantoid - Wikipedia

   en.wikipedia.org/wiki/Demantoid

   Demantoid is the green gemstone variety of the mineral andradite, a member of the garnet group of minerals. Andradite is a calcium- and iron-rich garnet. The chemical formula is Ca 3 Fe 2 (SiO 4) 3 with chromium substitution as the cause of the demantoid green color. Ferric iron is the cause of the yellow in the stone.

4. Category:Garnet gemstones - Wikipedia

   en.wikipedia.org/wiki/Category:Garnet_gemstones

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5. Garnet - Wikipedia

   en.wikipedia.org/wiki/Garnet

   Pure crystals of garnet are still used as gemstones. The gemstone varieties occur in shades of green, red, yellow, and orange. [54] In the United States it is known as the birthstone for January. [2] [55] [56] It is also the birthstone of Aquarius and Capricorn in tropical astrology. [57] [58] The garnet family is one of the most complex in the ...

6. List of U.S. state minerals, rocks, stones and gemstones

   en.wikipedia.org/wiki/List_of_U.S._state...

   In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...

7. 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.