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Walstromite inclusion with fan-shaped black fractures.
D-Colour Natural IIa Diamond with Walstromite Inclusion

A diamond is proven to have a superdeep origin through an inclusion of CaSiO3-walstromite.

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Gem Mountain mining site
Update on the Rock Creek Sapphire Deposit

An overview of recently expanded sapphire production at the Gem Mountain mine near Philipsburg, Montana.

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Summer 1990 Gem News International

A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewellery manufacturing techniques and industry trends.

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Four images of ruby from India
Indian Ruby Mining

An overview of ruby mining in the southern Indian states of Tamil Nadu and Karnataka.

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Oolitic opal block
Large Oolitic Opal Block

The natural-colour oolitic opal is the largest of its type examined by GIA.

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Pipi pearls from French Polynesia
Natural Pipi Pearls from Tahiti

An overview of natural "pipi" pearls from French Polynesia.

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