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Gerd Dreher agate lily and Patrick Dreher citrine mouse
Gem Virtuosos: The Drehers and Their Extraordinary Carvings

A look at the artistic heritage of the Drehers, an influential family of gem carvers in Idar-Oberstein, Germany.

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Various colors of nephrite
Characterisation of Mg and Fe Contents in Nephrite Using Raman Spectroscopy

Evaluates the usefulness of Raman spectroscopy in distinguishing the colour varieties of nephrite based on the relative ratio of Mg to Fe concentration.

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Summer 2016 Gems & Gemology Cover
Article
Summer 2016 G&G: Diamonds from Diavik, Responsible Sourcing and Fabergé Cossack Figures

A summary of the content found in the Summer 2016 issue of Gems & Gemology.

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Chipped Diamond
Article
How to Protect Your Diamond from Chipping

Find out more about what causes a diamond to chip, and 8 tips on how you can avoid chipping your diamond.

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Three stone diamond and platinum ring
Article
10 Tips for Buying a Diamond Online

Looking to buy a diamond online? We have 10 tips to help you click the “Buy Now” button with confidence.

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80422
Optimising Face-Up Appearance in Coloured Gemstone Faceting

How contrast patterns can increase perceived brightness and optimise a gemstone's appearance.

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Figure: 1 - The 52.49 carat
Article
An Imitation "Melo Pearl"

An Imitation "Melo Pearl"

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Figure 1: Three views of the same 372.46 ct pearl. Front (left), back (center) and end‐on side (right).
Article
An Unusual Pearl

An Unusual Pearl: On reviewing the images sent, it was apparent that this was going to be an interesting job.

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Figure 1: The external appearance (side‐on and down the drill‐holes) of the two pearls submitted for routine identification.
Article
Pearls with Unpleasant Odours

Pearls with Unpleasant Odours

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Whitish Graining with an Amorphous Appearance
The Impact of Internal Whitish And Reflective Graining on the Clarity Grading of D-To-Z Colour Diamonds at the GIA Laboratory

This article reviews the GIA Laboratory’s history of reporting on certain types of graining which are often the only characteristics present in large, high-clarity, high-colour diamonds.

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