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2. Tourmaline - Wikipedia

   en.wikipedia.org/wiki/Tourmaline

   Tourmaline is a six-member ring cyclosilicate ... Two dark-green rectangular tourmaline stones and one oval ... A large bluish-green tourmaline from Paraiba ...

3. Move over diamonds, these little-known gemstones are heating up

   www.aol.com/move-over-diamonds-little-known...

   In 2016, jeweler Olivia Young of Ouroboros sold a red spinel ring for £6,000 ($7,700). Last year, the client’s insurance company paid out £30,000 ($38,400) to replace it.

4. Elbaite - Wikipedia

   en.wikipedia.org/wiki/Elbaite

   Elbaite, a sodium, lithium, aluminium boro-silicate, with the chemical composition Na(Li 1.5 Al 1.5)Al 6 Si 6 O 18 (BO 3) 3 (OH) 4, [4] is a mineral species belonging to the six-member ring cyclosilicate tourmaline group. Elbaite forms three series, with dravite, with fluor-liddicoatite, and with schorl.

5. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Paraiba Tourmaline has become one of the most popular gemstones in recent times thanks to its color and is considered to be one of the important gemstones after rubies, emeralds, and sapphires according to Gübelin Gemlab. Even though it is a tourmaline, Paraiba Tourmaline is one of the most expensive gemstones. [31]

6. Spinel - Wikipedia

   en.wikipedia.org/wiki/Spinel

   Light blue synthetic spinel is a good imitation of aquamarine beryl, and green synthetic spinel is used as an emerald or tourmaline simulant. [29] By 2015, transparent spinel was being made in sheets and other shapes through sintering. [30]

7. Emerald - Wikipedia

   en.wikipedia.org/wiki/Emerald

   The finest emeralds are approximately 75% tone on a scale where 0% tone is colorless and 100% is opaque black. In addition, a fine emerald will be saturated and have a hue that is bright (vivid). Gray is the normal saturation modifier or mask found in emeralds; a grayish-green hue is a dull-green hue. [8]