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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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An Examination of Four Important Gems

Several famous and historical gemstones in the Smithsonian's collection are examined and reported on.

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Characterisation and Grading of Natural-Colour Pink Diamonds

Known for their great beauty and rarity, pink diamonds have long been sought after by jewellers, collectors and consumers.

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Characterisation and Grading of Natural-Colour Yellow Diamonds

A large number of natural-colour yellow diamonds are analysed 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 colour grading scale.

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

An Imitation "Melo Pearl"

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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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