Flame fusion creates long, tear-shaped pieces of synthetic corundum. This sample was made from a mix of aluminum oxide and chromium, which would have yielded a synthetic ruby. This piece, on display at the Natural History Museum in London, UK, was removed from the flame fusion process before completion. Photo by Aramgutang. Public Domain.
Lab-Created Opaque Red Corundum Rough
Flame fusion creates long, tear-shaped pieces of synthetic corundum. This sample, consisting of a mix of aluminum oxide and chromium, would have yielded a synthetic ruby. This piece, on display at the Natural History Museum in London, UK, was removed from the flame fusion process before completion. Photo by Aramgutang. Public Domain.
Article: What are Lab-Grown Sapphires?
Credit: Aramgutang
| Gemstone | Corundum |
| Natural or man made | Lab-made |
| Gem State | Rough |
| Color | Red, Green, Purple, White |
| Transparency | Opaque |
| Multi-color | More than 3 colors |