Another example of chaff. © Opal Auctions. Used with permission.
Opaque Black Play-of-Color Opal Stone Cabochon
Another example of chaff. © Opal Auctions. Used with permission.
Article: Identifying Opal Patterns
Credit: Opal Auctions
| Gemstone | Opal Stone |
| Natural or man made | Natural |
| Gem State | Cabochon |
| Color | Black |
| Transparency | Opaque |
| Photo phenomena | Play of Color |