A contraluz opal from Mexico, illuminated from back (approximately 4 cts). Photo © Joel E. Arem, PhD, FGA. Used with permission.
Blue Play-of-Color Opal Stone, 4 ct Faceted Shield Cut from Mexico
A contraluz opal from Mexico, illuminated from back (approximately 4 cts). Photo © Joel E. Arem, PhD, FGA. Used with permission.
Article: Opal Stones and Gems: Value, Price, and Jewelry Information
Credit: Joel E. Arem
| Gemstone | Opal Stone |
| Natural or man made | Natural |
| Origin | Mexico |
| Carat Weight | 4 |
| Gem State | Faceted |
| Color | Blue |
| Transparency | Transparent |
| Photo phenomena | Play of Color |