Gem News International Gems & Gemology, Spring 1990, Volume 26, No.1

Spring 1990 Gem News International

Tucson ‘90
            Beryl Triplet Cabochons
            Diffusion-Treated Corundum
            Star Ekanite
            Cat's-Eye Iolite
            Mother-of-Pearl Cameos
            Dyed Green Quartzite
            New World Sapphires
            Cat's-Eye Spinel
            Red Taaffeite
            Treated Paraiba Tourmalines
            Tanzanian Zircon
            Filled Diamond Update
            Computer Technology Enhances New Diamond Sorter
            Kimberlites Discovered in Canada
            Israeli-Japanese Joint Diamond-Polishing Venture
            Ghana Considers Private Mining
            Australians Develop New Technology for Diamond Exploration
Colored Stones
            New Amethyst Discovery in the Eastern United States
            Beryl Discovery in Finland
            New Find of Orthoclase
            California Star Quartz
            East African Spinels
            Oregon Sunstone Update
            Largest Known Faceted Liddicoatite Tourmaline Reportedly Found in Brazil
            Unusual Iridescent Zircon
Synthetics and Simulants
            Glass Imitation Emerald Crystal
            New Synthetic Ruby
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