Awards for James Shigley and Jonathan Muyal
Two regular G&G contributors receive awards for their work in the field of gemology.
The “Montana Queen” Sapphire
A rough blue sapphire crystal from the Rock Creek deposit is heat treated and cut to become the largest known faceted blue Montana sapphire.
Blue-Green Pyrope-Spessartine Garnet with High Vanadium
Garnets with a unique color and a previously unreported chemical composition are examined at GIA’s Carlsbad lab.
Update on Mozambique Ruby Mining and Trading
Current activity and production at various sites around Mozambique are reported.
High-quality amazonite currently available in the jewelry market is tested at GIA’s Carlsbad laboratory.
75th Swiss Gemmological Society Conference and European Gemmological Symposium
A report from the 75th Swiss Gemmological Society Conference and European Gemmological Symposium, held in Zermatt, Switzerland June 30–July 1, 2017.
Yellow, Green, and Blue Sapphires Reportedly from Antang and Gombe, Nigeria
Nineteen sapphires of various colors, reportedly from sources in northern Nigeria, are studied in GIA’s Tokyo laboratory.
Unusual Inclusions in Green Synthetic Sapphire
A green step-cut synthetic specimen hosts inclusions that provide insight into its growth method.
A Melee-Sized CVD Synthetic Diamond in Pearl and Diamond Jewelry
A CVD-grown melee is found in a pearl and diamond earring.
Multi-Color-Zoned Quartz from Brazil
A Brazilian quartz with unusual color zoning caused by variable iron content is examined.