from the Antique Jewelry University
Split boules of
flame fusion corundum.
Photo by Morion Company The rough form of synthetic corundum or spinel, produced through the
flame fusion/
Verneuil method, which is either pear or carrot shaped. The name comes from French ("ball" or "globe") and is grandfathered in due to the globular shape of the first successful created crystals. When created the boules are usually split in half to relieve the crystal of some of it's strain.
See also: boule ring, bombe
