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.
Update on Rock Creek Sapphire Deposit
An overview of recently expanded sapphire production at the Gem Mountain mine near Philipsburg, Montana.
Digital Photomicrography for Gemologists
A guide to capturing gem inclusion scenes using practical equipment and techniques and the appropriate image-refining software.
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.
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.
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.
A cracked apatite specimen reveals hidden treasure.
Introduction to the Micro-World of Gems
G&G’s new column takes a closer look at the hidden wonders found in gemstones.
Inclusions create chatoyancy in a colorless phenakite cabochon.
Unusual Pink Sapphire Bead
A pink sapphire bead with drill holes revealing ruby fragments is examined.