Search

1. Madagascar Sapphire: Low-Temperature Heat Treatment Experiments: (Articles); ... they undergo with low-temperature heat treatment in air, which is an oxidizing atmosphere. Introduction to this Madagascar Sapphire Study This study was sparked by a 2017 comment from noted Australian ...; Created on 27 October 2019
2. Gem Treatment Disclosure • Trust • Lotus Gemology: (Articles); ... too. Value Everyone is taught that gemstones are valuable for three primary reasons – beauty, rarity and durability. Let's consider treatments in light of these factors. The purpose of a treatment ...; Created on 04 January 2014
3. Apatite Oiling • Before and After: (Articles); Oil treatment has a significant impact on the appearance of an apatite. Apatite Oiling • Before and After Fissure filling of gemstones is an age-old treatment that can improve a stone’s clarity (Gems ...; Created on 16 May 2022
4. FAQs • Frequently Asked Questions: (Uncategorised); Gem Testing Reports at Lotus Gemology • FAQs Frequently asked questions regarding Lotus Gemology's gem testing, gem origin determination and gemstone treatment identification reports. Submit ...; Created on 21 February 2022
5. Oiled Spinel & Tanzanite • Shocking Revelations: (Articles); ... immerse rough into oil after it is unearthed. This is done not just to make viewing the interior easier, but primarily because it significantly enhances the gem's clarity. In our experience, such treatment ...; Created on 29 September 2020
6. Ruby & Sapphire Books • Collecting the Literature of Ruby & Sapphire (Corundum) • Hidden Treasure: (Articles); ... & treatments France was the epicenter of early research on the synthesis of ruby and thus much of the important work comes from French publications. Fremy’s Synthèse du Rubis (1891) is a rare and valuable ...; Created on 16 August 2020
7. Long-Wave Ultraviolet Torches • A Gemologist’s New Best Friend: (Articles); ... UV light. It can be a tremendous help in detecting treatments and synthetics, as well as a capable tool to screen pieces of jewelry with many smaller stones. One way this can help gemologists is with ...; Created on 22 May 2020
8. Gems & Gemology Lectures • Lotus Gemology Bangkok: (Articles); ... determination, treatment determination, and more. Lotus Gemology's Richard W. Hughes delivers a talk about connoisseurship of ruby and sapphire. Popular Topics Ruby & Sapphire: ...; Created on 26 March 2020
9. Gem Testing Reports at Lotus Gemology • FAQs: (FAQs); Frequently asked questions regarding Lotus Gemology's gem testing, gem origin determination and gemstone treatment identification reports.; Created on 19 March 2020
10. Madagascar: Sapphire Isle • Lecture • Tucson, AZ • 6 February 2020: (News); ... (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 26 January 2020
11. 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 21 January 2020
12. 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 07 December 2019
13. 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
14. 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
15. 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
16. 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
17. 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
18. 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
19. 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
20. 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

Start
Prev
1
2
3
Next
End