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1. Gem Treatment Disclosure • Trust • Lotus Gemology ...: (Articles); ... I believe what happens in between matters, too. Value Everyone is taught that gemstones are valuable for three primary reasons – beauty, rarity and durability. Let's consider treatments in ...; Created on 04 January 2014
2. Lecture • Madagascar: Sapphire Isle • Luzern, Switzerland • 1 May 2019: (News); ... on the heat treatment of Madagascar sapphire. When 1 May 2019 Where Gübelin Gem Lab Maihofstrasse 102, 6006 Luzern, Switzerland Note: This lecture is restricted to Gübelin employees ...; Created on 01 May 2019
3. Squeezing Sapphire • Corundums treated with high temperatures and low pressure (HT+P): (Articles); ... looks at the question of whether a separate disclosure is needed for the treatment. The following organizations have contributed to and endorse the contents of this article: CGL Central Gem Lab, ...; Created on 20 February 2019
4. Laos – Land of a Million Elephants... & Sapphires: (Articles); ... since the 1890s, due to the small size of the gems recovered, the promise was never fully realized. Little serious mining occurred until the 1960s. Like many another sapphire mine, modern heat treatments ...; Created on 18 February 2019
5. Sapphire With Growth Tube Cluster: (Articles); Surface-reaching growth tubes in a sapphire provide insight into the gem’s origin and treatment history. Surface-reaching growth tubes within a sapphire exhibit unaltered yellowish staining, ...; Created on 23 February 2018
6. Oiled Ruby: A Remarkable Visual: (Articles); ... it is sold under the brand name “King Ruby Red Oil”). Often this treatment can be identified by flattened gas bubbles in the fissures or by droplets of oil seeping out of the fissures on the surface when ...; Created on 23 February 2018
7. Lecture • Madagascar: Sapphire Isle • Tucson • 31 January 2018: (News); ... a series of ongoing experiments on the heat treatment of Madagascar sapphire. When 31 January 2018 Where 2018 Accredited Gemologists Association Tucson Conference Tucson University Park ...; Created on 31 January 2018
8. Lecture • Ruby Inclusions • Sweden • 17 June 2017: (News); ... discussed are ruby treatments and how to identify them. When 17 June 2017 Where Scandanavian Gem Symposium Sweden ...; Created on 17 June 2017
9. Gem Inclusion Pairs • Hyperion Siamese Twins: (Articles); ... so that one can directly compare details like changes in lighting and treatments. It would be both an identical work of art only by virtue of its difference. The same but different, he suggested, ...; Created on 29 January 2016
10. Hyperion Sources • Literature on Inclusions in Gemstones: (Articles); ... ol. 51, No. 1, Spring, pp. 2–17; RWHL. Crowningshield, R. and Nassau, K. (1981) The heat and diffusion treatment of natural and synthetic sapphires. Journal of Gemmology, Vol. 17, No. 8, Oct., pp. 52 ...; Created on 22 January 2016
11. Let It Bleed • New Rubies From Madagascar • Lotus Gemology: (Articles); ... the 3309 peak was present to some degree in virtually all samples. At the same time, the 3232 peak, which is often a strong indication of artificial heat treatment, was absent. This, along with the inclusions, ...; Created on 28 August 2015
12. Gem Enhancements Explained • Lotus Gemology: (Lab); ... on any/all 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 ...; Created on 14 May 2015
13. Instrument Review • GemmoRaman-532 • Lotus Gemology: (Articles); ... demand 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, ...; Created on 20 March 2015
14. Lotus Gemology Lab Alert for Oiled Gems: (Articles); ... 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, upon being told their stones have ...; Created on 09 March 2015
15. Lecture • Ruby Inclusions • Hong Kong • 18 September 2014: (News); ... ocations around 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 G ...; Created on 18 September 2014
16. Testing Yellow Sapphire • Passport to Obscurity • Lotus Gemology: (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
17. Ruby, Pink Sapphire & Padparadscha • Walking the Line • Lotus Gemology: (Articles); ... ner qualities, untreated stones may fetch a premium that is sometimes 50% or more when compared with treated stones of similar quality. A fraudulent treatment sometimes seen is where a pink s ...; Created on 01 May 2014
18. 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 ...; Created on 25 April 2014
19. Fun Down Under • Lenny Cram's Opal Mine • Lotus Gemology: (Articles); ... have opted to be part of the "precious stone" industry. So they should begin to behave like it. When a company develops an industry-crippling treatment such as the Pegasus (HPHT) diamond, ...; Created on 20 April 2014
20. Beryllium Diffusion in Sapphire • The Skin Game • Lotus Gemology: (Articles); ... gemologist Terry Coldham informed the author of a new treatment for orange sapphire. His initial report was that a burner in Chanthaburi, Thailand had developed a new method to treat off-color Songea (Tanzania) ...; Created on 19 April 2014

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