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Summer 1992, Volume 28, Issue 2

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Dyed Natural Corundum as a Ruby Imitation
K. Schmetzer, H.A. Hänni, E.P. Jegge, and F.-J. Schupp


The gemological properties of a new ruby imitation, produced by dyeing natural colorless to pale-colored corundum, are described. Microscopic and spectroscopic examination revealed a number of diagnostic features: fluorescence of the dye-containing fissures but not the surrounding corundum, red deposits on the fracture planes, and the absence of a 694-nm (chromium) doublet in the spectrum.

Appears on pages 112-115

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