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Faceted blue zircons
Reversible Colour Modification of Blue Zircon by Long-Wave Ultraviolet Radiation

Determines whether blue zircon, inadvertently altered to brown by exposure to long-wave UV radiation, can be restored to its original colour through the use of incandescent light.

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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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Faceting Large Gemstones

The techniques for cutting and polishing gemstone giants.

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The History and Gemmology of Queen Conch "Pearls"

This article reviews the history of the conch "pearl," discusses S. gigas and its fisheries, and examines the gemmological properties and other characteristics of this attractive material.

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Gemstone Durability: Design to Display

A treatise on the design, display, care and repair of fine gemstones.

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The Pearl in the Chicken: Pearl Recipes in Papyrus Holmiensis

Several pearl-in-chicken cleaning experiments are carried out to test the validity of recipes from an ancient Egyptian source.

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Peridot
Article
Peridot Care and Cleaning Guide

Learn about peridot's durability and how to care for your peridot jewellery.

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Article
Rose Quartz Care and Cleaning

Learn about rose quartz's durability and how to care for your rose quartz jewellery.

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Amethyst
Article
Amethyst Care and Cleaning Guide

Learn about amethyst's durability and how to care for your amethyst jewellery.

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Zircon
Article
Zircon Care and Cleaning Guide

Learn about Zircon's durability and how to care for your Zircon jewellery.

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