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Sapphire
The name “sapphire” can also apply to any corundum that’s not ruby red, another corundum variety.
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Finds from the Secondary Market
Dave Bindra shows some noteworthy pieces he obtained on the secondary market and shares his thoughts on the state of the colored stones market.
Sapphire and Garnet from Kalalani, Tanga Province, Tanzania
Diffusion-Induced Blue Spinel-Like Layer on Natural Sapphire
Three natural sapphires exhibiting a surface layer of gahnite are studied at the GGTL laboratory.
Prismatic Zircon in Kashmir Sapphire
Elongated zircon inclusions display attractive birefringent interference colors in a blue sapphire from Kashmir.
Tairus Hydrothermal Synthetic Sapphires Doped with Nickel and Chromium
Researchers of the Tairus joint venture have developed the technology for the hydrothermal growth of gem-quality crystals of synthetic sapphire.
Rainbow-Colored Partially Healed Fissure in Blue Sapphire
An iridescent partially healed fissure is observed in a blue sapphire from Sri Lanka.
Sapphire Mining Along the Upper Missouri River
A GIA team from Education and Lab Services visited the upper Missouri River sapphire deposits in Montana. The first sapphire discovery in the Treasure State, these deposits have been mined for over 150 years. The team witnessed the mining at the richest source, Eldorado Bar, and purchased a mine run to enrich GIA’s corundum collection.
Phosphorescence of Synthetic Sapphire
A synthetic colorless sapphires is tested to identify the source of its phosphorescence.
A Study of the Gems in Ciborium from Einsiedeln Abbey
The gemstones that adorn a late-16th-century ciborium from Einsiedeln Abbey in Einsiedeln, Switzerland.
Examination of Three-Phase Inclusions in Colorless, Yellow, and Blue Sapphires from Sri Lanka
Three-phase inclusions in untreated natural colorless, yellow, and blue sapphires from Sri Lanka were found to consist of liquid and gaseous carbon dioxide as well as needle-like to tabular crystals of diaspore.
Letters: More on Orange Luminescence in Corundum
Additional scientific details are provided to better understand orange luminescence in sapphire.
Winter 1994 Gem News International
A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.
