Fresh minty green Magnesite, colored by microscopically interspersed bluish-green Chrysoprase.  Flat, polished back with a beveled edge for ease of setting.  You will receive the exact gemstones shown in photos.

Weight: 17.32 carats
35.06 x 7.06 x 4.95 mm
35.07 x 7.06 x 4.40 mm

Gem Species: Magnesite
—Variety: -
Trade Name(s): Magnesite, Mint Magnesite, Nickeloan Magnesite, MagnePrase
Origin: Australia
Enhancement(s): (N) Natural

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Magnesite is a magnesium carbonate mineral (MgCO3), typically stark white and opaque. Green Magnesite, also known as Nickeloan Magnesite, is colored by traces of Nickel. 

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American Gem Trade Association Gemstone Enhancement Codes

Enhancement: Any treatment process other than cutting and polishing that improves the appearance (color/clarity/phenomena), durability, or availability of a gemstone.

(N) Natural No modification; natural stones which are not currently known to be enhanced (or currently has no known modification process).