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Mystery Pebbles in Quartz
Almandine Garnet from Phu Tho, Vietnam
Luminescent Synthetic Garnet-Like Crystals
In Memoriam: Heitor Barbosa
“Gran Dama” Brooch Featuring Large Melo Pearl
The centerpiece of this brooch is a 98.67 ct Melo pearl, believed to be one of the world's largest.
High-End Colored Gems
Diamond Geology
General Gemology and Jewelry
Fortieth Anniversary of the Belmont Mine
Brazilian Watermelon Tourmaline with Iris Effect
Quarterly Crystal: Molybdenite Phantoms in Quartz
Raman analysis identifies unusual inclusions in quartz.
Fluorescence Spectroscopy for Colored Pearl Treatment Screening
A nondestructive rapid screening technique uses fluorescence spectroscopy to identify treated colored pearls.