Gem News International Gems & Gemology, Volume 47, No. 4

Winter 2011 Gem News International

Colored Stones and Organic Materials
            Chondrodite from Mahenge, Tanzania
            Blue Dolomite from Colombia
            Fluorite from Namibia
            Common Opal from Laverton, Western Australia
            A Bicolor, Bi-Pattern Hydrophane Opal
            Chatoyant Quartz with Cinnabar Inclusions
            Quartz with Acicular Emerald Inclusions
            Quartz Carving with Inclusions of Izoklakeite
            Update on Ruby and Sapphire Mining in Pakistan
            Vanadium-Bearing Color-Change Sphene from Pakistan/Afghanistan
            Cobalt Blue-Colored Spinel from Khuoi Ngan, Vietnam
            Trapiche Spinel from Mogok, Myanmar
Synthetics and Simulants
            "Cat's-Eye Pearls": Unusual Non-Nacreous Calcitic Pearl Imitations
            Large Synthetic Quartz
            Sugar-Acid Treatment of Opal from Wollo, Ethiopia
Conference Reports
            32nd International Gemmological Conference
            2011 NAG Institute of Registered Valuers Conference
To view the full section, download the PDF above.           


Fluorite from Namibia - Additional Spectra
Trapiche Spinel from Mogok, Myanmar - Additional Spectra
January 9, 2012