Reports on a newly discovered treatment process for producing a deep blue color in natural spinel and proposes identification criteria.
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Gemstones formed in metamorphic environments offer insights into the earth’s history and the evolution of tectonic activity that led to their formation.
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A look at a rare volcanic glass from central Oregon with lapidary artist Tom Dodge.
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Offers a comprehensive look at a variety of augite from Dong Nai, Vietnam, detailing its formation and gemological characteristics.
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Investigates the mineral and chemical compositions and surface morphology characteristics of brown mammoth ivory to identify the origins of its brown color.
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A look at a unique matching set of emerald and brown matrix cabochons from the Muzo mine in Colombia.
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Various inclusions are observed in a batch of aquamarine samples from Xinjiang, China.
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Bluish green and white spheres create a beautiful inclusion scene in quartz from Larimer County, Colorado.
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Examination of a Pinctada maculata pearl reveals an interesting columnar calcite surface structure.
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past gems & gemology issues
Summer 2023
Volume 59, Issue 2
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