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21. Madagascar Ruby & Sapphire • Ruby & Sapphire: A Gemologist's Guid: (Articles); ... is suitable for heat treatment. Some pieces are colorless with blue cores; many are strongly zoned. The deposit, in which sapphires are found in altered marble and limestone silicates (‘skarn’), is at ...; Created on 18 October 2019
22. Jade • A Gemologist's Guide (2022) | Boo: (Books); Jade • A Gemologist's Guide Richard W. Hughes, editor | 2022 The study of jade is unlike any other gem, trespassing across all conventional boundaries, particularly those of the gemological and ...; Created on 24 August 2019
23. Gem Testing Labs • Tips on Choosing a Colored Gem Testing Lab • Lotus Gemology: (Articles); ... asked to do today is to determine the country of origin and the presence/absence and type of treatments. This requires extensive experience in the field, collecting samples from known localities and samples ...; Created on 21 August 2019
24. Ruby & Sapphire (Corundum) Inclusions • The Lotus Gemology Crystal Registry: (Articles); ... Cristobalite – Tetragonal – SiO2 – Polymorph of Coesite, Keatite, Mogánite, Quartz, Seifertite, Stishovite, Tridymite USA: Byproduct of heat treatment (Rock Creek, MT: Zwaan & Buter et al., 2015) ...; Created on 31 May 2019
25. Jade Books • Collecting the Literature of Jade • Hidden Treasure: (Articles); ... treatment updated with color illustrations. Much of what we know about Chinese jades today was first set forth in these books. Hansford also published several jade-related monographs, including his discussion ...; Created on 11 May 2019
26. Lecture • Madagascar: Sapphire Isle • Luzern, Switzerland • 1 May 2019: (News); ... The lecture also covers the gemology of Madagascar sapphire and ruby, including the most important identifying features, and some preliminary results from a series of ongoing experiments on the heat treatment ...; Created on 01 May 2019
27. Pressure Heated Sapphire • Squeezing Sapphire • Corundums treated with high temperatures and low pressure (HT+P): (Articles); ... 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, Japan; CISGEM, ...; Created on 20 February 2019
28. Laos Sapphires • Laos – Land of a Million Elephants... & Sapphires: (Articles); ... 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 make salable what was once too ...; Created on 18 February 2019
29. Sapphire With Growth Tube Cluster • Sapphire Inclusions: (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, an indication ...; Created on 23 February 2018
30. Oiled Ruby: A Remarkable Visual • Ruby Inclusions: (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
31. Lecture • Madagascar: Sapphire Isle • Tucson • 31 January 2018: (News); ... on the heat treatment of Madagascar sapphire. When 31 January 2018 Where 2018 Accredited Gemologists Association Tucson Conference Tucson University Park Hotel Conference Center 880 E. Second Street ...; Created on 31 January 2018
32. Lecture • Ruby Inclusions • Sweden • 17 June 2017: (News); A description of the inclusions found in ruby around the world, including Myanmar, Thailand/Cambodia, Vietnam, Tajikistan, Madagascar and Mozambique. Dream of the Red Chamber: The Internal World of ...; Created on 17 June 2017
33. Gem Inclusion Pairs • Hyperion Siamese Twins: (Articles); ... fissures between the individual crystal grains that make up the jade rock. These fissures are then filled with a polymer. Thus the treatment removes brown discoloration and greatly improves the translucency. ...; Created on 29 January 2016
34. 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
35. 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
36. 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
37. 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
38. 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
39. 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
40. Lotus Gemology Price List: (Articles); Gem Testing • Gemstone Identification • Origin Determination • Treatment ID Reports The Lotus Hardcover Report is simply the finest gemological report in the world. A Bangkok gemologist Lotus ...; Created on 04 July 2014

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