 | | Journal (article/letter/editorial) | | from Canada Downloaded by [Florida International University] at 19:52 23 August 2013 C anada is home... from emerald to sapphire, Canada has it all. Yet, for most of its history, Canada has been regarded...species have been found at one time or another in Canada (fig. 1). Some gem localities, such as those for...localities have been discovered; occurrences of sapphire in Nunavut, emerald in the Yukon and Ontario,...aquamarine in British Columbia are but a few examples. Direct exploration for colored gemstones by mining companies |  | | Journal (issue) | | Separation of Natural from Synthetic Colorless Sapphire Shane Elen and Emmanuel Fritsch pg. 25 REGULAR... Switzerland A. A. Levinson Calgary, Alberta, Canada James E. Shigley Carlsbad, California C. S. Hurlbut...F. C. Hawthorne at the University of Manitoba, Canada, performed electron microprobe analyses on (1)...sapphires in a range of colors. The bluegreen sapphire in the center (9.2 × 7.0 mm) weighs 2.65 ct. Photo...in basaltic-type bluish green to blue natural sapphire (see, e.g., Schmetzer and Bank, 1980, 1981). Consequently |  | | Journal (issue) | | determined to be an orange /red synthetic flame fusion sapphire. Figure 17: Silver concentrated within the surface...further testing. Interesting synthetics Synthetic sapphire Figure 18: Three cultured grey/black pearls illuminated... Figure 19: The Plato lines in a synthetic yellow sapphire. The stone was immersed in diiodomethane and viewed...crossed polars. Recently, an oval yellow synthetic sapphire revealed the sharpest Plato lines that we can...same sort of cobalt spectrum, although in one sapphire with an appreciable chromium content the cobalt |  | | Journal (issue) | | nephrite jade in Europe. Shortly after discovery, mining operations commenced and a substantial quantity...jade was produced (Traube, 1885). Subsequently mining operations were disrupted throughout the First...of recrystallization was probably rapid. 451 Mining and processing Extraction of nephrite jade from...essentially carried out in conjunction with serpentinite mining. Once the individual nephrite jade bodies were...Europe. Volume 3: Central Europe. The Institution of Mining and Metallurgy and the Mineralogical Society, London |  | | Journal (issue) | | (7) 2.14 ct blue sapphire, (8) 23.18 ct blue spinel, (9) 4.82 ct purple sapphire, (10) 5.32 ct Paraíba...1.15 ct purplepink sapphire, (16) 5.54 ct spessartine, (17) 8.04 ct orange sapphire, and (18) 3.48 ct... Switzerland A. A. Levinson Calgary, Alberta, Canada Christopher P. Smith Lucerne, Switzerland C....snapshot of a decade—and a profound one at that—from mining and localities to treatments and synthetics to...of Sakha), with exciting discoveries in northern Canada. Cultured pearls from French Polynesia, Australia |  | | Journal (issue) | | Argyle, courtesy of Rio Tinto; (4) an 11.16 ct sapphire from Madagascar, GIA Collection no. 31618; (5)...fields. Likewise, beryllium diffusion of ruby and sapphire brought together geologists, gemologists, and...exports from Myanmar disrupted supply channels for sapphire and ruby. And the proliferation of new sales avenues...the supply chain. The development of large-scale mining operations for colored gems has been in the news...of the decade forced major cutbacks in diamond mining and prompted industry banks to re-evaluate long-accepted |
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