Diamond Grit-Impregnated Tweezers: A Potentially Destructive Gemological Tool
The authors examined diamond grit-impregnated tweezers that reportedly were being marketed out of Japan.
The Distinction of Natural from Synthetic Alexandrite by Infrared Spectroscopy
A useful way to identify stones that contain no distinguishing inclusions.
Infrared Spectroscopy in Gem Identification
The authors describe the new Nicolet 60SX Fourier transform infrared spectrometer recently acquired by CIA'S Research Department.
The Eyepiece Pointer: A Useful Microscope Accessory
The eyepiece pointer simplifies the task of pointing out microscopic features on or in any gemstone.
The First-Order Red Compensator: An Effective Gemological Tool
The many gemological applications of the first-order red compensator.
Pitfalls in Color Grading Diamonds by Machine
Two major sources of error make spectroscopically determined color grades unreliable.
The GEM DiamondMaster and the Thermal Properties of Gems
Thermal properties and the potential applications of the GEM DiamondMaster in testing them.
Artistry in Rock Crystal: The Van Pelt Collection
The lapidary arts of Harold and Erica Van Pelt.
Shadowing: A New Method of Image Enhancement for Gemological Microscopy
Shadowing as an enhancement technique is discussed.
Pinpoint Illumination: A Controllable System of Lighting for Gem Microscopy
A review of a very useful hand-held tool for jewelers and gemologists.