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
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