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.
Engraved Gems: A Historical Perspective
The history of engraved gems and a look at the engraving process itself.
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.
Carving Gem-Quality Opal
An examination of the challenges of carving gem-quality opal.
Pinpoint Illumination: A Controllable System of Lighting for Gem Microscopy
A review of a very useful hand-held tool for jewelers and gemologists.
Two Notable Color-Change Garnets
The gemological properties and chemical compositions of two unusual color-change garnets are reviewed.
The Cutting Properties of Kunzite
The cutting of a one-kilo kunzite crystal demonstrates the problems inherent in working with this stone.