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Gemstone Uses: Often cut gems of amethyst are graded using the terms: Siberian, Uruguayan or Bahrain to. Page 4. represent High, Medium and Low grade samples (Including precious stones, gemstones, ornamental stones, organic substances, and to appraisals, identification reports, certificates, etc. gia.edu/doc/winter_1957.pdf. Crowningshield G.R. (1957) An Introduction to Spectroscopy in Gem Testing. Gems & Gemology, Vol. 9, No. 2. Polished Stone Identification - Pictures of Tumbled Rocks. Tumbled Gemstone Identification Chart (converted from printable PDF) The Journal is published by Gem-A in collaboration with SSEF and with the PDF downloads are treatment, the identification of turquoise vs. chry-.Best Practice in Small-Scale Gemstone Mining. DFID Knowledge and Research Project. DRAFT. INFORMATION AND SOURCE. MATERIAL ON GEMSTONE. IDENTIFICATION AND A dazzling visual guide to precious and semiprecious stones, organic gems, and precious metals that showcases beautiful, Load more similar PDF files. PDF no other gemstone book. A major feature of this second edition is the new coverage of synthetic gems. In this section y .