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21. Lecture | Madagascar | Sapphire Isle | Tucson | 6 February 2020: (Lectures); ... (a.k.a. Sierra Leone). The lecture also covers the gemology of Madagascar sapphire and ruby, including the most important identifying features, and results from a series of experiments on the heat treatment ...; Created on February 06, 2020
22. FTIR in Gem Testing | A Pink Sapphire Lesson: (Articles); A discussion of DRIFTS vs the Beam Condenser FTIR attachment in the testing of pink sapphire. The DRIFTS accessory is generally much better at unmasking heat treatment in ruby and sapphire. FTIR in ...; Created on January 21, 2020
23. World Sapphire Market Update | 2020 | Lotus Gemology: (Articles); ... Most of the buying in Madagascar is done by Sri Lankan buyers and as the stones are taken to Sri Lanka for cutting and treatment, many of the blues now sold in Sri Lanka are actually from Madagascar. This ...; Created on December 07, 2019
24. 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 October 18, 2019
25. Book | Jade | A Gemologist's Guide | 202: (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 August 24, 2019
26. How to Choose the Best Colored Gem Testing Lab: (Articles); ... of origin and the presence/absence and type of treatments. This requires extensive experience in the field, collecting samples from known localities and samples that are positively not treated. Labs that ...; Created on August 21, 2019
27. 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 May 31, 2019
28. 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 May 11, 2019
29. Lecture | Madagascar | Sapphire Isle | Luzern, Switzerland | 1 May 2019: (Lectures); ... 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 May 01, 2019
30. Pressure Heated 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 February 20, 2019
31. Lao 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 February 18, 2019
32. 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 February 23, 2018
33. 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 February 23, 2018
34. Lecture | Madagascar | Sapphire Isle | Tucson | 31 January 2018: (Lectures); ... 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 January 31, 2018
35. Lecture | Ruby Inclusions | Sweden | 17 June 2017: (Lectures); 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 June 17, 2017
36. 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 January 29, 2016
37. 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 January 22, 2016
38. Ruby From Madagascar | Let It Bleed: (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 August 28, 2015
39. 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 May 14, 2015
40. Instrument Review | GemmoRaman-532: (Book/Instrument Reviews); ... 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 March 20, 2015