White common opal with fine black manganese oxide dendrites.  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: 8.97 carats
Length: 20.40 mm
Width: 15.44 mm
Height: 3.99 mm

Gem Species: Opal
--Variety: Dendritic
Phenomenal: No; no play-of-color
Trade Name(s): Dendritic Opal, Dendritic Opalite*, Merlinite
Origin: Australia
Enhancement(s): (N) Natural

----------------------------------------------
* Using the term "opalite" to describe natural non-phenomenal (no play-of-color) common opal is misleading. Opalite is a man-made glass; it is neither synthetic opal nor natural opal.
----------------------------------------------

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).