Opal Stone – Lab-made, Tumbled, Green
While most Sterling opals show black potch lines, some lapidaries cut cabochons without these features. © Opal Auctions. Used with permission.
Article: Synthetic Opal Types
Credit: Opal Auctions
Gemstone | Opal Stone |
Natural or man made | Lab-made |
Gem State | Tumbled |
Color | Green |
Transparency | Opaque |
Photo phenomena | Play of Color |