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Diamond Grit-Impregnated Tweezers: A Potentially Destructive Gemological Tool

The authors examined diamond grit-impregnated tweezers that reportedly were being marketed out of Japan.

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Natural Alexandrite
The Distinction of Natural from Synthetic Alexandrite by Infrared Spectroscopy

A useful way to identify stones that contain no distinguishing inclusions.

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Infrared Spectroscopy in Gem Identification

The authors describe the new Nicolet 60SX Fourier transform infrared spectrometer recently acquired by CIA'S Research Department.

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The Eyepiece Pointer: A Useful Microscope Accessory

The eyepiece pointer simplifies the task of pointing out microscopic features on or in any gemstone.

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The First-Order Red Compensator: An Effective Gemological Tool

The many gemological applications of the first-order red compensator.

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Pitfalls in Color Grading Diamonds by Machine

Two major sources of error make spectroscopically determined color grades unreliable.

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The GEM DiamondMaster and the Thermal Properties of Gems

Thermal properties and the potential applications of the GEM DiamondMaster in testing them.

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Artistry in Rock Crystal: The Van Pelt Collection

The lapidary arts of Harold and Erica Van Pelt.

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Shadowing: A New Method of Image Enhancement for Gemological Microscopy

Shadowing as an enhancement technique is discussed.

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Pinpoint Illumination: A Controllable System of Lighting for Gem Microscopy

A review of a very useful hand-held tool for jewelers and gemologists.

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