A Simple Procedure to Separate Natural from Synthetic Amethyst on the Basis of Twinning
Robert Crowninghshield, Cornelius Hurlbut, and C.W. Fryer
Pink Topaz from Pakistan
Edward G¸belin, Giorgio Graziani, and A.H. Kazmi
Carbon Dioxide Fluid Inclusions As Proof of Natural-Colored Corundum
John I. Koivula
Contributions to a History of Gemology: Specific GravityóOrigins and Development of the Hydrostatic Method
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