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Two blue sapphires side by side
Article
G&G Announces Most Valuable Article Awards

G&G announces the winners of the Dr Edward J. Gübelin Most Valuable Article Awards for 2019.

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A face-up view of a cushion cut diamond with blue color.
Article
Gems & Gemology’s 7 Most Unusual Encounters from 2019

Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.

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Looking down the crystal axis of a back-lit 58.83 ct trapiche emerald
Article
Emerald: The Superstar of Trapiche Gemstones

Trapiche emeralds, which display a distinct six-spoke wheel pattern, set the standard as some of the finest and most spectacular crystals ever unearthed.

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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).

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Sixteen samples of facet-quality ruby
Preliminary Observations on Facet-Grade Ruby from Longido, Tanzania

Microscopic observation and trace element analysis is performed on rubies from Longido.

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Suggested Reading on Rubies and Their Inclusions

Suggested Reading on Rubies and Their Inclusions

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A round, bright red gem displayed on a dark gray background.
Article
The Red Hot Gems of Summer

These red, pink and orange hued gems evoke passion and excitement – and are sure-fire accessories for sultry summer days.

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Dattaw and Baw Mar
Article
Visit Two of Mogok’s Most Important Mines with GIA

Join GIA’s field gemmologists as they visit two of Mogok’s most important mines: the Dattaw ruby mine and Baw Mar sapphire mine.

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Map showing Muling’s location
Ruby and Sapphire from Muling, China

An emerging corundum deposit in north-eastern China is discussed.

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Article
Pyrope Garnet and Montana Sapphires Highlight Winter 2015 G&G

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

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