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Dalmatian stone samples
True Colours of “Dalmatian Jasper”

Discusses the mineralogical composition and provenance of this spotted decorative gemstone.

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Emerald crystals from Colombia, Afghanistan, and Zambia
Photoluminescence Spectra of Emeralds from Colombia, Afghanistan and Zambia

Compares PL spectroscopy data of 48 emerald samples from three countries to evaluate the usefulness of the technique in geographic origin determination.

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Rough CLIPPIR diamonds
The Very Deep Origin of the World’s Biggest Diamonds

Explores an exceptional family of diamonds, referred to as “CLIPPIR” (Cullinan-like, Large, Inclusion-Poor, Pure, Irregular and Resorbed), that formed in a super-deep environment.

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A blue synthetic star sapphire from past production of Wiede’s Carbidwerk
Synthetic Star Sapphires and Rubies Produced by Wiede’s Carbidwerk, Freyung, Germany

Details the process used by Wiede’s Carbidwerk to produce star synthetic corundum from the mid-1950s until the 1970s.

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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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Sapphire Chart Article: Suggested Reading on Sapphires and Their Inclusions

Suggested Reading on Sapphires and their Inclusions

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Six cuprian liddicoatite tourmalines
Cuprian Liddicoatite Tourmaline

Identifies 13 copper-bearing tourmalines, which have traditionally been assumed to be elbaite species, as liddicoatite.

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Jadeite boulder from Itoigawa, Japan
Japanese Jadeite: History, Characteristics and Comparison with Other Sources

Examines the sources, colour, texture and chemical composition of jadeite from Japanese deposits.

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Rough danburite crystals from Luc Yen, Vietnam
A New Find of Danburite in the Luc Yen Mining Area, Vietnam

Reports on a recently discovered eluvial deposit of honey yellow danburite with excellent transparency.

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Evan Smith studies images of diamond inclusions on a computer.
Article
Postdoctoral Programme Gives Scientists Access to Rare Research Opportunities

GIA’s postdoctoral programme gives researchers access to gemmological data, equipment, and rare, unusual and large gems in its laboratories.

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