Synthetic & Fake Rubies
Experts may refer to synthetic rubies as "cultured" or "created" stones. They create these synthetic gems in laboratories using the same conditions and materials in which natural rubies form. Fake rubies, unlike their synthetic and genuine counterparts, are cheap, red-colored, glass stones.
Since experts create synthetic rubies in the same conditions as natural rubies, it is often very difficult for the buyer to differentiate between the two. Gemologists, however, can use the consistency of color, shape and clarity they find in natural rubies to differentiate the gems from their more flawed, synthetic counterparts. Fake rubies are devoid of the composition, structure, brilliance and refractive index visible in natural and synthetic rubies.
Fake rubies tend to be bigger in size than their natural counterparts and are very red in color. In addition, surface scratches and tiny bubbles easily give away a fake. A fake's facet edges are soft, while true rubies exhibit sharp edges. Appraisers can test a ruby for light absorption and synthetic-specific inclusions to determine its authenticity.