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2. Rubellite - Wikipedia

   en.wikipedia.org/wiki/Rubellite

   Rubellite used to be the most expensive and prized gem in the tourmaline group but has since been eclipsed by the Paraiba tourmaline. [7] [8] The most valuable specimens are colored red and lack brown. [3] Those that are of ruby color are the most valuable. [9]

3. Tourmaline - Wikipedia

   en.wikipedia.org/wiki/Tourmaline

   An excellent example of watermelon tourmaline jewelry is a brooch piece (1969, gold, watermelon tourmaline, diamonds) by Andrew Grima (British, b. Italy, 1921–2007), in the collection of Kimberly Klosterman and on display at the Cincinnati Art Museum. [19] Some forms of tourmaline are dichroic; they change color when viewed from different ...

4. Beryl - Wikipedia

   en.wikipedia.org/wiki/Beryl

   Nowadays, it is most commonly used for gemstone purposes. [45] [46] The gem value of goshenite is relatively low. However, goshenite can be colored yellow, green, pink, blue and in intermediate colors by irradiating it with high-energy particles. The resulting color depends on the content of Ca, Sc, Ti, V, Fe, and Co impurities. [40]

5. Elbaite - Wikipedia

   en.wikipedia.org/wiki/Elbaite

   Elbaite is allochromatic, meaning trace amounts of impurities can tint crystals, and it can be strongly pleochroic. Every color of the rainbow may be represented by elbaite, some exhibiting multicolor zonation. Microscopic acicular inclusions in some elbaite crystals show the cat's eye effect in polished cabochons.

6. Rhodolite - Wikipedia

   en.wikipedia.org/wiki/Rhodolite

   The colors from different rhodolite sources may vary from a lavender pink to raspberry rose or raspberry red and from purplish-violet (grape) to purplish red. [ 5 ] 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 ...

7. Red beryl - Wikipedia

   en.wikipedia.org/wiki/Red_beryl

   Red beryl, formerly known as bixbite and marketed as red emerald or scarlet emerald, is an extremely rare variety of beryl as well as one of the rarest minerals on Earth. [ 1 ] [ 2 ] : 19 The gem gets its red color from manganese ions embedded inside of beryllium aluminium cyclosilicate crystals. [ 1 ]