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Download scientific diagram | Blue color zoning observed in some of the unusual rubies; immersed in methylene iodide. Photo by S. Saeseaw © GIA. from publication: Challenging Synthetic Rubies Examined in GIA's Bangkok and Hong Kong Laboratories | Forty faceted rubies which were submitted to the GIA Bangkok and Hong Kong laboratories were examined. The stones ranged from 1.20 to 4.48 carats. Standard gemological testing was carried out using the OPL hand held spectroscope to establish that the material was ruby. | Ruby, Fluorescence and Color | ResearchGate, the professional network for scientists.
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