One of the rarest opal types, black opals from Australia. © Joel E. Arem, PhD, FGA. Used with permission.
Opaque Black Play-of-Color Black Opal Cabochon from Australia
One of the rarest opal types, black opals from Australia. © Joel E. Arem, PhD, FGA. Used with permission.
Article: Eight Opal Types Explained
Credit: Joel E. Arem, PhD, FGA
| Gemstone | Opal Stone, Black Opal, Precious Opal |
| Natural or man made | Natural |
| Origin | Australia |
| Gem State | Tumbled |
| Color | Black |
| Transparency | Opaque |
| Photo phenomena | Play of Color |