Synthetic Ruby Specimen Sold as Natural
Recently, the Dubai Central Laboratory received a rough specimen for identification. The red crystal had a distorted hexagonal shape and was attached to some matrix material. It was identified as ruby by its absorption spectrum with a handheld spectroscope, a finding confirmed by UV-Vis-NIR spectroscopy. Using a microscope, we observed curved striae and filled cavities; gas bubbles were visible in the filling material. We therefore identified this sample as synthetic ruby with filled fractures. Raman
G&G has reported on a number of synthetic rubies sold as natural crystals (see Fall 1993 Lab Notes, p. 204; Fall 2001 Gem News International, pp. 243-245). This case again illustrates the importance of gem laboratory reports and the necessity of thoroughly examining a piece before purchase.
- Nazar Ahmed and Hassan Al Marzooqi
Gemstone unit, Dubai Central Laboratory
Dubai, United Arab Emirates
As always. Never just collect, understand. Do what you can to understand and learn about an item you collect. Whether its coins, stamps, stones or minerals. There are always people out there with the intention of deceiving the unwary. Fake minerals are not a new thing. A few years back I was involved in prosecuting a man for producing fake wire silver specimens from a locality I know very well and it has NEVER produced specimens of this type. When you examine a specimen always look for glue lines, even a genuine piece may have been repaired.
Think about known localities and what type of specimens they provide. Do the specimen and matrix seem compatible/plausible? Rubies in limestone are unlikely, but in marble are very likely. Does the purported source match the type of specimen? Ruby in marble from Tanzania? No way. Be vigilant and if in doubt, get advice.
Take care,
Damian
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