Synthetic corundum gems (rubies and sapphires). Photo © Joel E. Arem, PhD, FGA. Used with permission.
Lab-Created Red Corundum Faceted
Synthetic corundum gems (rubies and sapphires). Photo © Joel E. Arem, PhD, FGA. Used with permission.
Article: A Guide to Gem Classification
Credit: Joel E. Arem, PhD, FGA
| Gemstone | Corundum |
| Natural or man made | Lab-made |
| Gem State | Faceted |
| Color | Red, Orange, Blue, Pink |
| Transparency | Transparent |