GIA Gem Project

Spinel Colors
Photo by Robert Weldon/GIA, courtesy Dr. E. J. Gübelin Collection
GIA Collection 34618, 34661, 34662, 34908
Found in nearly every color – most notably red, pink and blue – spinels are popular gemstones because of their abundance, moderate cost and attractiveness. Red spinel has often been mistaken for ruby. Some spinel exhibits asterism (a star-shaped pattern of reflections), chatoyancy (a “cat’s-eye” effect seen in reflected light) or a color change when viewed alternately under incandescent and fluorescent lighting.

GIA Gem Project

GIA has studied more than 400 important gemstones in the Edward J. Gübelin Gem Collection and is committed to sharing this repository of gemological information.

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