Synthetic corundum fluoresces orange under ultraviolet light. This material is red-purple in incandescent light and grayish purple in natural light. Synthetic corundum, 368nm fl, photo by Bob Fosbury. Public Domain.
Lab-Created Red Glow in the dark Corundum Rough
Synthetic corundum fluoresces orange under ultraviolet light. This material is red-purple in incandescent light and grayish purple in natural light. Synthetic corundum, 368nm fl, photo by Bob Fosbury. Public Domain.
Article: Alexandrite Buying Guide
Credit: Bob Fosbury
| Gemstone | Corundum |
| Natural or man made | Lab-made |
| Gem State | Rough |
| Color | Red |
| Transparency | Transparent |
| Photo phenomena | Glow in the Dark |