The large but irregular size and shape in this opal's play of color resemble flagstone. Photo by Ra'ike. Licensed under CC By 3.0.
Article: Identifying Opal Patterns
Credit: Ra’ike
| Gemstone | Opal Stone |
| Natural or man made | Natural |
| Gem State | Cabochon |
| Color | Black |
| Transparency | Opaque |
| Photo phenomena | Play of Color |
