The Separation of Natural from Synthetic Emeralds by Infrared Spectroscopy
The technique is nondestructive and, with Fourier transform instrumentation, extremely rapid in comparison to most laboratory methods.
Three Notable Fancy-Color Diamonds: Purplish Red, Purple-Pink, and Reddish Purple
The description and properties of three fancy-color diamonds auctioned at Christie's.
Contribution to the Identification of Treated Colored Diamonds: Diamonds with Peculiar Color-Zoned Pavilions
Some treated yellow and blue-to-green diamonds show a peculiar color zoning when viewed through the pavilion.
A Preliminary Gemological Study of Synthetic Diamond Thin Films
Diamond Grit-Impregnated Tweezers: A Potentially Destructive Gemological Tool
The authors examined diamond grit-impregnated tweezers that reportedly were being marketed out of Japan.
A Cubic Zirconia Refractometer
Scanning Electron Microscopy in Gemology
An explanation of the basic principles of the SEM-EDS system with examples of its efficacy in the field of gemology.
Hornbill Ivory
The author reviews the nature of this material and some of the forms into which it has been fashioned, as well as means of identifying hornbill ivory from other ivories and from imitations.
The Chromium Content of Lechleitner Synthetic Emerald Overgrowth
The higher the chromium content in synthetic emerald overgrowth, the darker the coating and appearance of the stone will be.
Summer 1982 G&G Book Reviews
Two Notable Color-Change Garnets
The gemological properties and chemical compositions of two unusual color-change garnets are reviewed.
Pinpoint Illumination: A Controllable System of Lighting for Gem Microscopy
A review of a very useful hand-held tool for jewelers and gemologists.
The GEM DiamondMaster and the Thermal Properties of Gems
Thermal properties and the potential applications of the GEM DiamondMaster in testing them.
Expanded Deutsches Edelsteinmuseum of Idar-Oberstein, Germany
A new display area has helped this unique museum to establish itself as one of the finest gemology exhibits in the world.
Opal from Queretaro, Mexico: Occurrence and Inclusions
An examination of play-of-color opal from Mexico and its variety of inclusions.
Peridot from Tanzania
Investigation of a Cat's-Eye Scapolite from Sri Lanka
The authors examine a Sri Lankan cut gemstone with intense chatoyancy.
The First-Order Red Compensator: An Effective Gemological Tool
The many gemological applications of the first-order red compensator.
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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