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 Gübelin, 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 Gravity - Origins and Development of the Hydrostatic Method
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