Opal Stone – Lab-made, Cabochon, Red
Gilson synthetic opals. Photo © Joel E. Arem, PhD, FGA. Used with permission.
Article: Appraising Opals
Credit: Joel E. Arem, PhD, FGA
Gemstone | Opal Stone |
Natural or man made | Lab-made |
Origin details | Gilson synthetic |
Gem State | Cabochon |
Color | Red, White, Black |
Transparency | Opaque |
Photo phenomena | Play of Color |