Preview of Nature Art Science with Paula Crevoshay
Renowned designer Paula Crevoshay discusses artistic influences and her latest creations.
Opal from West Java, Indonesia
Description of Indonesian opal reportedly from West Java.
The Red Hot Gems of Summer
These red, pink and orange hued gems evoke passion and excitement – and are surefire accessories for sultry summer days.
Chrysoprase and Prase Opal from Haneti, Central Tanzania
Commercial quantities of gem-quality chrysoprase and green prase opal (nickel-bearing chalcedony and common opal, respectively) have been recovered from altered serpentinite deposits near Haneti, Tanzania.
Green Opal From East Africa
Gemological and chemical analysis of bright green gem-quality opal from Tanzania.
Opal from Queretaro, Mexico: Occurrence and Inclusions
An examination of play-of-color opal from Mexico and its variety of inclusions.
The first documented UV-reactive chemical treatment to make opal appear tenebrescent.
Water Immersion Reveals Dye in Fire Opal
A simple test easily detected dye treatment in fire opal.