Black Opal
Note the dark backing on this thin piece of opal. Photo courtesy of liveauctioneers.com and Jasper52.
Article: Common Gemstone Treatments Cheat Sheet
Credit: Jasper52
Gemstone | Black Opal, Opal Stone, Precious Opal |
Natural or man made | Assembled |
Gem State | Cabochon |
Color | Blue |
Transparency | Opaque |
Photo phenomena | Play of Color |