Garnets from Madagascar with a Color Change of Blue-Green to Purple
Gemological, chemical, spectroscopic, and microscopic properties of blue-green color-change garnets from a new deposit near Bekily, Madagascar, are given.
Celebrating 75 Years of Gems & Gemology
Gems & Gemology, the professional quarterly of GIA, debuted in 1934
Winter 1995 G&G Book Reviews
“Photo Masters for Diamond Grading”; “A Sparkling Age, 17th Century Diamond Jewellery”
Infrared Spectroscopy in Gem Identification
The authors describe the new Nicolet 60SX Fourier transform infrared spectrometer recently acquired by CIA'S Research Department.
An Examination of Four Important Gems
Several famous and historical gemstones in the Smithsonian's collection are examined and reported on.
Pitfalls in Color Grading Diamonds by Machine
Two major sources of error make spectroscopically determined color grades unreliable.
A Chart for the Separation of Natural and Synthetic Diamonds
Exploration of a chart designed to give jewelers and gemologists a practical guide to identifying synthetic diamonds as they enter the jewelry trade.
Color Grading of Colored Diamonds in the GIA Gem Trade Laboratory
How GIA’s Gem Trade Laboratory grades colored diamonds, including an expanded color grading terminology, is explained.
Grading the Hope Diamond
One of the most popular exhibits at the Smithsonian Institution, the stunning Fancy Dark grayish blue Hope diamond was formally graded by GIA’s gem laboratory.
Characterization and Grading of Natural-Color Yellow Diamonds
A large number of natural-color yellow diamonds are analyzed using grading and appearance aspects among other characteristics to clarify the differences between them and the light yellow diamonds associated with GIA's D-to-Z color grading scale.