Blue color zoning observed in some of the unusual rubies; immersed

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.

Color in minerals

14 Mineral Descriptions – Mineralogy

Minerals, Free Full-Text

Ruby Cushion 3.09 Carat - Rare Gemstone Company

Ruby and sapphires ::: Gemology

Geology and mineralogy of sapphire-rich metasomatites (sapphirites

Sudarat SAESEAW, Senior Manager Coloredstone Identification, MAster degree of Analytical Chemistry, G.G., FGA, Gemological Institute of America, Carlsbad, Colored stones Identification

Treated Blue Sapphires from Sri Lanka

Ruby and sapphires ::: Gemology