Real-Time Microradiography of Pearls: A Comparison Between Detectors
Compares the image quality provided by real-time microradiographic imaging (RTX) units fitted with two different detectors: an image intensifier (II) and a flat panel detector (FPD).
Accurate Reporting of Key Trace Elements in Ruby and Sapphire Using Matrix-Matched Standards
Presents a group of corundum standards developed by GIA to improve the accuracy and efficiency of its laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) instruments.
Color Grading “D-to-Z” Diamonds at the GIA Laboratory
This article discusses the history and ongoing development of GIA's color grading system, and explains how its laboratory applies it.
Optimizing Face-Up Appearance in Colored Gemstone Faceting
How contrast patterns can increase perceived brightness and optimize a gemstone's appearance.
Portable Instruments and Tips on Practical Gemology in the Field
Buying gems or jewelry can be challenging even when one has access to a fully equipped lab.
De Beers Natural versus Synthetic Diamond Verification Instruments
Two instruments have been developed at De Beers DTC Research Centre, Maidenhead, to distinguish synthetic diamonds from natural diamonds.
Diamond Grit-Impregnated Tweezers: A Potentially Destructive Gemological Tool
The authors examined diamond grit-impregnated tweezers that reportedly were being marketed out of Japan.
Faceting Large Gemstones
The techniques for cutting and polishing gemstone giants.
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.
Gemstone Durability: Design to Display
A treatise on the design, display, care and repair of fine gemstones.