Dendrites of metallic dark gray magnetite in a black basalt host with ribbons of shiny metallic yellow pyrite.  Natural surface top, lightly polished.  Flat, polished back with a beveled edge for ease of setting.  You will receive the exact gemstone shown in photos.

Weight: 35.98 carats
Length: 30.57 mm
Width: 13.95 mm
Height: 6.19 mm

Gem Species: Pyrite-Magnetite
—Variety: —
Trade Name(s):  Pyrite-Magnetite, Healer’s Gold*
Origin: New Mexico, USA 
Enhancement(s): (N) Natural

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* Using the term "gold" to describe this material is deceptive and a punishable crime under US Federal Trade Commission regulations.  Pyrite is a naturally occurring iron disulfide mineral with the chemical formula FeS2 (iron (II) disulfide).  Pyrite's metallic luster and pale yellow hue give it a superficial resemblance to gold.
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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).