Bronzite is the iron-rich form of the mineral Enstatite.  It contains chatoyant bronze colored spangles and dark gray metallic areas (very likely hematite).  Polished to a vitreous (glassy) luster.  Flat, polished back with a beveled edge for ease of setting.  You will receive the exact gemstone shown in photos.  

Weight: 28.10 carats
Length: 27.91 mm
Width: 20.01 mm
Height: 4.97 mm

Gem Species: Enstatite
--Variety: Bronzite
Trade Name(s): Bronzite
Origin: Brazil 
Enhancement(s): (N) Natural

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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).