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A high-tech digitizing machine cradles the books for scanning instead of forcing them into a flat, spine-damaging position.
Article
Rare Books Project Puts Gem and Jewelry History Within Reach

More than 200 historically significant books housed in the GIA Library have been digitized and made available for free.

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Green Amber
Characterization of “Green Amber” With Infrared and Nuclear Magnetic Resonance Spectroscopy

A peridot-like bright greenish yellow to green gem material called “green amber” has recently appeared in the gem market.

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Nanocut Plasmaetched Diamonds
Cutting Diffraction Gratings to Improve Dispersion (“Fire”) in Diamonds

A new microlithography process developed to create high-resolution diffraction grating patterns on portions of certain facets can improve the dispersion of light and thus the amount of “fire” in a diamond.

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A wide range of jewelry pieces with the round brilliant diamond cut
A Foundation for Grading the Overall Cut Quality of Round Brilliant Cut Diamonds

The GIA diamond cut grading system described here includes the components of brightness, fire, scintillation, polish, and symmetry, as well as weight and durability concerns, into a single overall grade for cut quality for standard round brilliants.

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0.45 ct Pink CVD Labgrown Diamond
Strongly Colored Pink CVD Lab-Grown Diamonds

Pink CVD lab-grown products can be separated from natural and treated-color natural pink diamonds by a combination of gemological and spectroscopic properties, which are explored in this study.

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Indian necklace
Article
Jewelers to the Maharajas of Jaipur and Modern-Day Moguls

Enter a world not well-known in the West—the world of the maharajas and their jewelry, coveted by the modern-day moguls of business, entertainment, and royalty. See the fantastic works of art made today in the form of enameled Kundan meena jewelry and the regal look of polki diamonds.

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Emerald rough
Article
Jaipur, India: The Emerald Cutting and Trading Powerhouse

Jaipur, India, is a leading emerald cutting and trading center for the global gem and jewelry industry. See inside the industry with a GIA field team, and learn the intricacies of a business seldom seen by the public or most members of the industry.

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Chinese carving
Origin Determination of Dolomite-Related White Nephrite through Iterative-Binary Linear Discriminant Analysis

A technique for origin identification based on statistical analysis and LA-ICP-MS spectrometry.

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Observations on GE-Processed Diamonds: A Photographic Record

Observations made at GIA on 858 GE-processed diamonds revealed several interesting features that may be diagnostic of this kind of diamond. Specifically, a significant percentage exhibited a slightly hazy appearance, noticeable internal graining, and other unusual internal features.

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Article
Summer 2015 G&G: Dual-Stars, Photomicrography Guide, Rubies from Tajikistan, New Micro-World Section

G&G Brief presents an overview of the content of the Summer 2015 issue of Gems & Gemology.

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