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Summer 2009 G&G Lab Notes
A Simple Procedure to Separate Natural from Synthetic Amethyst on the Basis of Twinning
Kashmir Sapphire
The history of the Kashmir mines, the beautiful sapphires found there, and the outlook for the future.
Diamonds from Guyana, Ekanite from Sri Lanka, a New Amber Source in Vietnam, and More...
Appendix 2: Comparison of LA-ICP-MS and EPMA Data, Part 2
Dyed Natural Corundum as a Ruby Imitation
The gemological properties of a new ruby imitation, produced by dyeing natural colorless to pale-colored corundum, are described.
New Deposit of Black Opal from Ethiopia
The Stayish mine in Ethiopia’s Wollo province has been producing black opal since 2013.
Yellow Topaz from Germany, Emerald Mining in Austria’s Habachtal Region, a Return to Tucson, and More…
“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
