Black opal: Australia (freeform cabochons approximately 30 cts each). Photo © Joel E. Arem, PhD, FGA. Used with permission.
Opaque Black Play-of-Color Black Opal, 60 ct Other from Australia
Black opal: Australia (freeform cabochons approximately 30 cts each). Photo © Joel E. Arem, PhD, FGA. Used with permission.
Article: Opal Stones and Gems: Value, Price, and Jewelry Information
Credit: Joel E. Arem, PhD, FGA
| Gemstone | Opal Stone, Black Opal, Precious Opal |
| Natural or man made | Natural |
| Origin | Australia |
| Carat Weight | <i class="fa fa-square facet-search-color-swatch" style="color:#e61047"></i> slightly purplish Red (slpR) |
| Gem State | Other |
| Color | Black |
| Transparency | Opaque |
| Photo phenomena | Play of Color |