Aura Quartz
Commercial name for mostly natural lower-grade quartz that has undergone laboratory treatment. In a vacuum chamber (heated to about 870 °C) an ultra-thin layer of…
Category: Gem or Scam? Library
Azotic Topaz
Commercial name for laboratory-treated white topaz coated with titanium. Do you have a nice example of this stone and would like to provide a photo…
Auralite 23®
Registered trade name for amethyst with inclusions of ferrous minerals, in most cases probably hematite. This amethyst variant is claimed to have inclusions or traces…
Azumar™
Unregistered commercial name coined in 2014 by Robert Simmons (Heaven & Earth) and used for material he marketed at the major mineral show in Tucson,…
Aurora Quartz
Fantasy name for natural quartz in which rainbow colors occur due to refraction of light on internal fracture surfaces. Other names used for quartz with…
Bahia ‘citrine’
Commercial name for a heated amethyst (also called heat-treated amethyst or HTA) with a yellow-orange to orange-brown color. Because genuine (untreated) citrine is a rare…
Australian jade
Misleading commercial name for chrysoprase, a green variety of chalcedony. As is often the case, the name jade is used to make the customer pay…
Banded agate
Designation for reddish-brown agate with black and/or white bands, used particularly for the recently marketed polished stones from Madagascar. These large hand stones or “jumbo”…
Avalonite (™)
Used as a commercial name for a blue-violet banded variety of chalcedony. Also called blue lace agate or simply chalcedony. Judy Hall1 and Hans Timmers2…
Bastite
The name bastite is primarily used in the trade for a fuchsite-containing chert from Western Australia, also known by the trade names Dragon Stone or…
