Fall 1986

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The PDF version of this issue is available at no charge. Visit www.gia.eduA Simple Procedure to Separate Natural from Synthetic Amethyst on the Basis of TwinningRobert Crowninghshi eld, Cornelius Hurlbut, and C.W. FryerPink Topaz from PakistanEdward Gübelin, Giorgio Graziani, and A.H. KazmiCarbon Dioxide Fluid Inclusions As Proof of Natural-Colored CorundumJohn I. KoivulaContributions to a History of Gemology: Specific Gravity - Origins and Development of the Hydrostatic MethodJohn SinkankasColombage-Ara ScheeliteMahinda GunawardeneEvery issue also includes the most up-to-date reports from the GIA Laboratory (Lab Notes) and gemologists around the world (Gem News International).GIA students and alumni save 10% on back issues! Enter coupon code GGALUM at checkout.Usually ships in 3-5 business days. SKU: 438604 Show more