Geudas are whitish, milky sapphires frequently found in Sri Lanka. With heat treatments, they can show fine blue as well as yellow and orange colors. Photo © Joel E. Arem, PhD, FGA. Used with permission.
Orange Sapphire Faceted, Heat-Treated from Sri Lanka
Geudas are whitish, milky sapphires frequently found in Sri Lanka. With heat treatments, they can show fine blue as well as yellow and orange colors. Photo © Joel E. Arem, PhD, FGA. Used with permission.
Article: Ruby and Sapphire Origins
Credit: Joel E. Arem, PhD, FGA
| Gemstone | Sapphire, Corundum |
| Treatments | Heat Treatment |
| Natural or man made | Natural |
| Origin | Sri Lanka |
| Gem State | Faceted |
| Color | Orange, Yellow |
| Transparency | Transparent |