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“Paraíba”-Type Copper-Bearing Tourmaline from Brazil, Nigeria, and Mozambique: Chemical Fingerprinting By LA-ICP-MS
Gem-quality bright blue to green “Paraíba”-type Cu-bearing tourmaline is now known from deposits in Africa (Nigeria and Mozambique), in addition to three commercial localities in Brazil (in Paraíba and Rio Grande do Norte States).
Natural-Looking Inclusions in a Ramaura Synthetic Ruby
Mercury Free Mining Pilot Program
Gemstone Durability: Design to Display
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
