Examines a technique for setting cut garnets on glass objects, invented by Claudius vom Creutz of Nuremberg in the late sixteenth century.
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Reports on the recent production of precious and common opal from a centuries-old locality.
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Documents the gemological properties, chemical composition, and appearance of petrified tree fern discovered in northeast China.
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Explores the formation of sedimentary rocks, gems found and formed in sedimentary environments, and the alluvial mining of these gems.
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Provides a visual guide to the internal features of different varieties of beryl.
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A comprehensive look at Texas topaz, detailing its gemological and compositional characteristics and providing a basis for using trace element concentrations to identify its origin.
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A report on a new blue variety of amblygonite-montebrasite from Rwanda.
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A tapered baguette-cut diamond exhibits two major color zones.
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Pleochroic colors caused by cyclic twinning produce a kaleidoscope effect in alexandrite.
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FTIR spectroscopy shows that the existence of carbon dioxide gas bubbles in a negative crystal in sapphire is no longer proof of the absence of heat treatment.
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past gems & gemology issues
Winter 2023
Volume 59, Issue 4
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