Search - Results from #20

21. Inclusions in Gemstones • Hyperion Literature Sources: (Articles); ... R. and Nassau, K. (1981) The heat and diffusion treatment of natural and synthetic sapphires. Journal of Gemmology, Vol. 17, No. 8, Oct., pp. 528–541; RWHL*. Du Toit, G., Hughes, R.W. et al. (2006) Beryllium-treated ...; Created on 22 January 2016
22. Ruby From Madagascar • Let It Bleed • Lotus Gemology: (Articles); ... indication of artificial heat treatment, was absent. This, along with the inclusions, suggested that all the stones submitted had not been subjected to heat treatment. Some specimens showed a large IR ...; Created on 28 August 2015
23. Gem Enhancements Explained • Lotus Gemology: (Lab); ... treatments which are detected. Our approach is to give our customers the same information we would want when purchasing a gem. The following tables explain the enhancement terminology as given on Lotus ...; Created on 14 May 2015
24. GemmoRaman-532 • Instrument Review • Lotus Gemology: (Articles); ... than ever. With treatments become increasingly sophisticated, gemologists and traders search for new tools to help identify stones. How does one make the call on a completely clean spinel, with no ...; Created on 20 March 2015
25. Oiled Gems Lab Alert • Lotus Gemology: (Articles); ... decide what is and is not acceptable in terms of treatments. Certainly there is a place in the market for natural, treated, synthetic and imitation stones. That said, we have had a string of clients who, ...; Created on 09 March 2015
26. Lecture • Ruby Inclusions • Hong Kong • 18 September 2014: (News); ... the world are revealed. Also discussed are ruby treatments and how to identify them. When 18 September 2014; 10:00–11:00 AM Where Gübelin Gem Lab Conference Hong Kong Gem and Jewellery Show Room ...; Created on 18 September 2014
27. Lotus Gemology Price List: (Articles); Lotus Gemology produces what we feel are the finest gem testing reports in the gemological field. Each report includes gemstone identification, treatment identification and, in certain cases (mainly ruby, ...; Created on 04 July 2014
28. Testing Yellow Sapphire • Passport to Obscurity: (Articles); ... piece of jewelry. In gems of this type, inclusions are often sufficient to immediately identify the host as a natural sapphire, as well as prove or disprove heat treatment. When present, a 3160 infrared ...; Created on 31 May 2014
29. Ruby, Pink Sapphire & Padparadscha • Walking the Line: (Articles); ... when compared with treated stones of similar quality. A fraudulent treatment sometimes seen is where a pink sapphire is irradiated to give it a padparadscha color. The resulting color is unstable and ...; Created on 01 May 2014
30. FTIR in Gem Testing • FTIR Intrigue • Lotus Gemology: (Articles); ... Such treatment is typically unmasked by reference to FTIR spectra. When we first checked the FTIR spectrum via the DRIFTS method, large polymer peaks were found. A recheck with the beam condenser method ...; Created on 25 April 2014
31. Lenny Cram's Opal Mine • Fun Down Under • Lotus Gemolog: (Articles); ... industry. So they should begin to behave like it. When a company develops an industry-crippling treatment such as the Pegasus (HPHT) diamond, that company has a responsibility to assist in its identification ...; Created on 20 April 2014
32. Beryllium Diffusion in Orange Sapphire • The Skin Game: (Articles); ... Skin Game March 2002 – In October 2001, Australian gemologist Terry Coldham informed the author of a new treatment for orange sapphire. His initial report was that a burner in Chanthaburi, Thailand had ...; Created on 19 April 2014
33. Jade in Upper Burma • Heaven and Hell • Lotus Gemology: (Articles); ... treatment applied. The efficacy of this bug protection was made crystal clear in Mogaung, where Hughes and French gem dealer, Olivier Galibert slept side-by-side in the same bed. Come morning, Galibert' ...; Created on 17 April 2014
34. Burma’s Jade Mines • Tracing the Green Line • Lotus Gemology: (Articles); ... the skin by pinching it with a coin. The Maw-sisa miner at left is prepared for any kind of flying pest, as was Richard Hughes after he had the treatment applied. The efficacy of this bug protection was ...; Created on 14 April 2014
35. Pigeon's Blood • Pilgrimage to Mogok – Valley of Rubie: (Articles); ... of their clarity and color to heat treatment, this statement does not seem so outlandish (unfortunately, most Burmese rubies are today also heat treated). For the love of a brother Brotherly ...; Created on 12 April 2014
36. Gem Testing with the Spectroscope • Lotus Gemology: (Articles); ... not undergone high-temperature heat treatment. A complete identification was possible in this case with just two instruments. An added bonus in this instance was that no refractometer was needed, which ...; Created on 09 March 2014
37. Photoatlas of Inclusions in Gemstones, Volume 2 • Book Review • Lotus Gemology: (Book Reviews); ... The effects of heat treatment on zoisite (tanzanite). Page 809. Eye candy But I doth protest too much. The Photoatlas series ...; Created on 07 March 2014
38. Lotus Gemology Publications • Substance: (Library); ... Low-temperature heat treatment experiments. Gems & Gemology, Vol. 55, No. 2, Summer, pp. 184–197. Hughes, E.B. (2019) G&G Micro-World: Curved banding in flame-fusion synthetic sapphires. Gems & Gemology, ...; Created on 27 February 2014
39. Ruby & Sapphire • A Gemologist's Guide • Order Page • Lotus Gemolog: (Uncategorised); ... synthetics and treatments, everything is here. Ruby & Sapphire—A Gemologist’s Guide represents the definitive reference on the subject. With over 1000 photos, maps and illustrations and 3500 references, ...; Created on 26 February 2014
40. History of Chanthaburi & Pailin • Moontown • Lotus Gemology: (Articles); ... after heat treatment (virtually identical to those from Thailand), it is the blue sapphires that are its major boast. In fact, the word for blue sapphire in the Thai language is pailin (ไพลิน), its name ...; Created on 15 February 2014

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