The Cutting Properties of Kunzite
The cutting of a one-kilo kunzite crystal demonstrates the problems inherent in working with this stone.
Photographing Inclusions
A discussion of the techniques important in producing top-quality photomicrographs.
Ruby in Diamond
Heat Treating Ruby and Sapphire: Technical Aspects
A review of heat treatment methods available for use on natural or synthetic corundum.
哥伦比亚的祖母绿 (英语)
A comprehensive review of the history and geology of Colombian emeralds together with descriptions of some of the most famous gems to come from this locality.
Color In Gems: The New Technologies
A discussion of work being done to enhance color in gemstones, as well as techniques used at the California Institute of Technology to detect whether colors are natural or enhanced.
Artificially Induced Color in Amethyst-Citrine Quartz
A new and rather unusual gem material and possible treatments are discussed.
Zabargad: The Ancient Peridot Island in The Red Sea
A report on the island of Zabargad and the peridot for which it is known.
The Hidden Beauty of Amber: New Light on an Old Subject
The surprising inner world of inorganic inclusions in amber is explored through the use of polarized light and microscopic techniques.
X-ray Computed Microtomography Applied to Pearls: Methodology, Advantages, and Limitations
X-ray computed microtomography reveals the internal features of pearls with great detail.
Polymer-Filled Aquamarine
Sweet Home Mine Rhodochrosite from 1888
A rhodochrosite on display at AGTA dates back more than a century to Colorado’s Alma Mining District.
Identification of Natural, Reconstructed, and Imitation Root Amber
A “Cobalt Blue” Gahnospinel
Large Faceted Pallasitic Peridot
Aegirine in Poudretteite
Spray of Columbite Crystals in Topaz
Turquoise Planet Earth
Two Pearls of Indian Cultural Significance
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