Corundum
Thai ruby (3.66 cts) and Sri Lankan sapphire (2.75 cts). 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 | Natural |
Gem State | Faceted |
Color | RedBlue, |
Transparency | Transparent |