Summer 2015 - Volume 51, Issue 2
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Diamond-bearing eclogite xenoliths from the Ardo So Ver dykes.
Diamond-Bearing Eclogite Xenoliths from the Ardo So Ver Dykes

Mineralogical examination of diamond-bearing material from South Africa reveals the specimens to be eclogite xenoliths.

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Gem Mountain mining site
Update on Rock Creek Sapphire Deposit

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

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Digital Photomicrography for Gemologists

A guide to capturing gem inclusion scenes using practical equipment and techniques and the appropriate image-refining software.

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Assortment of Linde synthetic star rubies and sapphires
Dual-Color Double Stars in Ruby, Sapphire, and Quartz: Cause and Historical Account

Examines a form of asterism comprising two six-rayed stars, one white and one that exhibits the stone’s bodycolor. Firsthand accounts and a survey of patent documents reveal that diffusion has been used to create or enhance this optical phenomenon in synthetic and possibly natural corundum since the 1950s.

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Bright red faceted ruby in a gold ring, from the large and potentially productive Snezhnoe deposit in Tajikistan.
Rubies and Sapphires from Snezhnoe, Tajikistan

This large marble-hosted occurrence in the Pamir Mountains is a potentially productive source of corundum, including ruby with a bright red color reminiscent of “pigeon’s blood” Burmese rubies.

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Imperial Jade of Burma and Mutton-Fat Jade of India: Mining, Trade, and Use from Antiquity to the Present
Books: Imperial Jade of Burma and Mutton-Fat Jade of India

Review of S.K. Samuels’s Imperial Jade of Burma and Mutton-Fat Jade of India: Mining, Trade, and Use from Antiquity to the Present.

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Polished sphere with calcite inclusion
Apatite “Piñata”

A cracked apatite specimen reveals hidden treasure.

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Introduction to the Micro-World of Gems

G&G’s new column takes a closer look at the hidden wonders found in gemstones.

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Phenakite with cat’s eye viewed with point-source illumination.
Cat’s-Eye Phenakite

Inclusions create chatoyancy in a colorless phenakite cabochon.

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Pink sapphire bead with drill holes.
Unusual Pink Sapphire Bead

A pink sapphire bead with drill holes revealing ruby fragments is examined.

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