Site map for Lotus Gemology
Bangkok-based gem lab testing colored gemstones for origin, treatments and natural vs. synthetic
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- Gemology Lectures
- Latest Lectures
- Lecture | Enhanced Emeralds/Madagascar Sapphire | Santa Fe | 29 August 2005
- Lecture | Enhanced Emeralds/Madagascar Sapphire | Honolulu | 10 November 2005
- Lecture | Enhanced Emeralds/Madagascar Sapphire | San Francisco | 10 January 2006
- Lecture | Madagascar Sapphire | Orlando | 29 April 2006
- Lecture | From Madagascar to Malysheva | Toronto | 28 October 2006
- Lecture | Gem Hunting in Central Asia | Bangkok | 7 December 2006
- Lecture | From Madagascar to Tajikistan | Tucson | 1 February 2007
- Lecture | Jade | Stone of Heaven | Pasadena, CA | 31 March 2007
- Lecture | People & Places | Washington, DC | 9 April 2007
- Lecture | Jade | Stone of Heaven | Carlsbad, CA | 21 April 2007
- Lecture | People & Places | Santa Ana, CA | 23 June 2007
- Lecture | People & Places | Tucson | 8 February 2008
- Lecture | People & Places | Bangkok | 9 July 2008
- Lecture | Hunting gems in Southern Tanzania | Bangkok | 9 March 2009
- Lecture | Jade | Stone of Heaven | Bangkok | 29 April 2009
- Lecture | Humanistic Gemology | Tucson | 3 February 2010
- Lecture | Gemological Heresies | Bangkok | 29 June 2011
- Lecture | Heaven Below | Jaipur, India | 2 November 2011
- Lecture | Andesine | A Panel Discussion | Tucson | 1 February 2012
- Lecture | People & Places | Seoul, S. Korea | 20 April 2012
- Lecture | Jade | Stone of Heaven | London | 4 November 2012
- Lecture | Padparadscha Sapphire | Bangkok | 12 December 2012
- Lecture | Mogok | Valley of Rubies | Carlsbad, CA | 6 April 2013
- Lecture | Padparadscha Sapphire | Bangkok | 29 May 2013
- Lecture | Ruby & Sapphire | A Collector's Guide | Tucson, AZ | 6 February 2014
- Lecture | Ruby & Sapphire | A Collector's Guide | Bangkok | 26 February 2014
- Lecture | Ruby & Sapphire | A Collector's Guide | Adelaide | 26 July 2014
- Lecture | Gemological Heresies | Adelaide | 27 July 2014
- Lecture | Gemological Heresies Part 2 | Bangkok | 24 September 2014
- Lectures | Ruby & Sapphire | A Collector's Guide | Hong Kong | 18 September 2014
- Lecture | Ruby Inclusions | Hong Kong | 18 September 2014
- Lecture | Mogok Ruby | Hong Kong | 20 September 2014
- Lecture | Gemological Heresies | London | 2 November 2014
- Lecture | Ten Thoughts on Gemology | Chiang Mai | 9 December 2014
- Lecture | Gemological Heresies | Arusha, Tanzania | 22 April 2015
- Lecture | Ruby & Sapphire | A Collector's Guide | Arusha, Tanzania | 22 April 2015
- Lecture | Padparadscha Sapphire | Colombo | 17 May 2015
- Lecture | Mogok Ruby | Paris | 8 June 2015
- Lecture | Ruby & Sapphire | A Collector's Guide | Taipei | 14 August 2015
- Lecture | Gemological Heresies | Taipei | 16 August 2015
- Lecture | Ruby & Sapphire | A Collector's Guide | Hualien, Taiwan | 4 December 2015
- Lecture | Ten Thoughts on Gemology | Tucson | 3 February 2016
- Lecture | Ruby & Sapphire | A Collector's Guide | Shanghai | 28 May 2016
- Lecture | Ruby & Sapphire | A Collector's Guide | Hong Kong | 17 September 2016
- Lecture | Ruby & Sapphire | A Collector's Guide | Shanghai | 15 December 2016
- Lecture | Sapphire Around the World | Carlsbad, CA | 8 April 2017
- Lecture | Madagascar | Sapphire Isle | Paris | 12 June 2017
- Lecture | Ruby Inclusions | Sweden | 17 June 2017
- Lecture | Ruby & Sapphire | The Secret World | Dallas | 26 August 2017
- Lecture | Seeing Red | Ruby | Bangkok | 4 November 2017
- Lecture | Gemological Heresies | Colombo | 17 December 2017
- Lecture | Ruby Inclusions | Yangon, Myanmar | 11 January 2018
- Lecture | Madagascar | Sapphire Isle | Tucson | 31 January 2018
- Lecture | Seeing Red | Ruby | Baltimore | 12 August 2018
- Lecture | Gemological Heresies | Washington, DC | 14 August 2018
- Lecture | Jade | China's Gift to the World | Bangkok | 10 September 2018
- Lecture | Gem Color Types | Chicago | 13 September 2018
- Lecture | Seeing Red | Ruby | Hong Kong | 15 September 2018
- Lecture | Jade | China's Gift to the World | Shanghai | 1 December 2018
- Lecture | Ruby & Sapphire | A Collector's Guide | Changchun, China | 15 December 2018
- Lecture | Gem Color Types | Tucson | 4 February 2019
- Lecture | Journey to the Center of the Gem | Tucson | 6 February 2019
- Lecture | Jade | China's Gift to the World | San Francisco | 25 March 2019
- Lecture | Journey to the Center of the Gem | Bangkok | 27 March 2019
- Lecture | Ruby & Sapphire | A Collector's Guide | Houston | 27 March 2019
- Lecture | Jade | China's Gift to the World | Houston | 28 March 2019
- Lecture | Jade | China's Gift to the World | Shanghai, China | 18 April 2019
- Lecture | Jade | China's Gift to the World | Suzhou, China | 19 April 2019
- Lecture | Jade | China's Gift to the World | Switzerland | 29 April 2019
- Lecture | Ruby | Seeing Red | Switzerland | 30 April 2019
- Lecture | Madagascar | Sapphire Isle | Luzern, Switzerland | 1 May 2019
- Lecture | Ruby & Sapphire | A Collector's Guide | Wuhan, China | 25 May 2019
- Lecture | Jade | China's Gift to the World | Taipei | 16 June 2019
- Lecture | Jade | China's Gift to the World | Shanghai, China | 25 June 2019
- Lecture | Jade | China's Gift to the World | Tucson | 5 February 2020
- Lecture | Madagascar | Sapphire Isle | Tucson | 6 February 2020
- Lecture | Inside Out: Journey into the Center of a Gem | Paris | 12 March 2020
- Lecture | Microscopy & Photomicrography | Birmingham, UK | 16 March 2020
- Lecture | Jade | China's Gift to the World | Houston | 16 July 2022
- Lecture | Jade | China's Gift to the World | Copenhagen | 1–2 October 2022
- Lecture | Jade | China's Gift to the World | London | 6 November 2022
- Lecture | A Canary in the Ruby Mine | Tokyo | 26 October 2023
- Lecture | A Canary in the Ruby Mine | Tucson | 31 January 2024
- Lecture | Jade | A Workshop | Tucson | 1 February 2023
- Lecture | Jade | A Workshop | Tucson | 28 January 2024
- Lecture | A Canary in the Ruby Mine | Tucson | 29 January 2023
- Lecture | Greasy Business | Oiled Gems Fraud | Taipei | 18 March 2023
- Lecture | Jade | China's Gift to the World | Tucson | 29 January 2023
- Lecture | Greasy Business | Oiled Gems Fraud | Tucson | 1 February 2024
- Lecture | The Mystery of Inclusions | A Panel Discussion | Tucson | 4 February 2023
- Lecture | Earth's Time Capsule | Inclusions in Colored Gems & Diamonds | Bangkok | 20 February 2023
- Lecture | Inside Out | Journey into the Center of a Gem | Tokyo | 2 March 2023
- Lecture | A Canary in the Ruby Mine | Bangkok | 9 September 2023
- Memberships
- Thanks
- Site Map
- Reports
- Resources
- Articles
- Burmese Sapphire Giants
- Burma's Jade Mines | An Annotated Occidental History
- Identifying Yellow Sapphire Using the Blue Filter
- Ruby and Spinel in Tajikistan | Moon Over the Pamirs
- Rutile in Corundum | Following the Silk Road
- Padparadscha Sapphire & the Ownership of Words
- Cobalt-Doped Glass-Filled Sapphires | An Update
- Fiber-Optic Light in Gemology | Living in the Dark Ages
- Gem Inclusions & the Symmetry of Crystals | Inside Out
- Guangzhou Jade Market Puzzle | A Chinese Jade Box
- Gemology in the 21st Century | Betwixt Two Worlds
- Tanzanite Mines of Merelani | Working the Blueseam
- Downtown | Gem Hunting in Tanzania
- Ruby Connoisseurship | Seeing Red
- Sapphire Connoisseurship | Judging Sapphire | Passion Fruit
- Gem Treatment Disclosure | Trust
- Fracture Healing of Ruby | Fluxed Up
- In Search of the Lost Andesine Mines | Part 1 | Hunting Barack Osama in Tibet
- In Search of the Lost Andesine Mines | Part 2 | Faith
- Spinel | Resurrection of a Classic
- Heat Seeker | UV Fluorescence as a Gemological Tool
- The Last Thai Ruby Miner | Red Sky at Dusk
- Mogok Revisited | A Brief Stay in Heaven
- Mogok Geology Primer | Rock Talk
- Ruby, Sapphire & Spinel Auction Records | Under the Hammer
- Sorcerers & Sapphires | A Visit to Madagascar
- Buying at the Source | Dick's Law and Other Sundry Maxims of the East
- Burmese Jade | The Inscrutable Gem
- Jade Buying Guide | Jade Auction Records
- Emerald Buddha | Symbol of the Kingdom of Thailand
- Verneuil Synthetic Corundum ID | Dangerous Curves
- Brilliance, Windows, and Extinction in Gemstones
- Black Prince's Ruby | Blood-Red Souvenir of Conquest | Spinel
- History of Chanthaburi & Pailin | Moontown
- Gem Testing with the Spectroscope
- Pigeon's Blood | Pilgrimage to Mogok – Valley of Rubies
- Burma’s Jade Mines | Tracing the Green Line
- Russian Jade Deposits | From Russia with Jade
- Jade in Upper Burma | Heaven and Hell
- Beryllium Diffusion in Orange Sapphire | The Skin Game
- Lenny Cram's Opal Mine | Fun Down Under
- Hunting the Mother Lode Abroad | Gemological Travel
- FTIR in Gem Testing | FTIR Intrigue
- Ruby, Pink Sapphire & Padparadscha | Walking the Line
- Pleochroism in Faceted Gems | An Introduction
- Emerald & Alexandrite from Russia | A Closer Look
- Testing Yellow Sapphire | Passport to Obscurity
- Seeing Red | Genetics & Color Vision | Lotus Gemology
- Rutile Silk in Sapphire | Discovery in 1878
- Oiled Gems Lab Alert • Lotus Gemology
- Mozambique Ruby | Red Rain Pours into the Market
- Dana Schorr | In Memoriam
- Ruby From Madagascar | Let It Bleed
- 从孔雀蓝到鸽血红 细数宝石之美 • 红蓝宝石之动人色泽
- Inclusions in Gemstones | Hyperion Literature Sources
- Gem Inclusion Pairs | Hyperion Siamese Twins
- จากพีค็อกบลูถึงสีเลือดนก • นิยามแห่งสีจากโลตัสเจมโมโลจี
- Padparadscha or Pretender | An Unusual Pink-Orange Sapphire
- Spinel Inclusions | Beyond Octahedra
- A Sapphire's Secret | Synthetic Yellow Sapphire
- Crystal Optics with the Refractometer
- Oiled Ruby | A Remarkable Visual
- Sapphire With Growth Tube Cluster | Sapphire Inclusions
- Mogok Ruby With Remarkable Twinned Calcite Inclusion
- Six-Rayed Star in Sapphire from Myanmar
- Colored Stone Grading | A Heretic's Guide
- Lao Sapphires | Laos – Land of a Million Elephants... & Sapphires
- Pressure Heated Sapphire | Corundums treated with high temperatures and low pressure (HT+P)
- Jade Books | Collecting the Literature of Jade • Hidden Treasure
- Spinel Inclusions | An Exercise in Aesthetics
- Ruby & Sapphire (Corundum) Inclusions | The Lotus Gemology Crystal Registry
- How to Choose the Best Colored Gem Testing Lab
- Madagascar Ruby & Sapphire | Ruby & Sapphire | A Gemologist's Guide
- Madagascar Sapphire | Low-Temperature Heat Treatment Experiments
- World Sapphire Market Update | 2020 | Lotus Gemology
- FTIR in Gem Testing | A Pink Sapphire Lesson
- Contemporary Jade Carving in China • Interview with Lin Tze-Chuan
- Long-Wave Ultraviolet Torches • A Gemologist’s New Best Friend
- Black Star Sapphire Surprise
- Jade | A Lifetime In Search of Heaven
- Ruby & Sapphire Books | Collecting the Literature of Corundum | Hidden Treasure
- Oiled Spinel & Tanzanite | Shocking Revelations
- Made You Look | The Challenges of Identifying Inclusions at First Sight
- Bubbling Up | Carbon Dioxide Inclusion in Sapphire
- An A-maze-ing Fingerprint in Spinel
- Vietnamese Skyline
- Apatite Oiling | Before and After
- Canary in the Ruby Mine | Low-Temperature Heating of Burmese Ruby
- Apatite in Blue Sapphire
- Blue Apatite in Tanzanian Garnet
- Yellow Sapphires with Unstable Color
- Curved Banding in Flame-Fusion Synthetic Sapphires
- Describing Color in Gems | A Fool's Guide
- The Hardness of Fei Cui Jade | A Gemological Perspective
- Meet the Extraordinary 40 | Richard Hughes Honored by Jewellery News Asia
- Detecting Corundum Fillers with the Long-Wave UV Torch
- From Fei Cui to Jadeite and Back | Questions and Answers
- Gem Treatment Disclosure | Notes from the Eastern Front
- Books
- Book | Corundum | 1990
- Book | Halford-Watkins | Book of Ruby & Sapphire | 2012
- Book | Ruby & Sapphire (Corundum) | 1992
- Book | Ruby & Sapphire | A Gemologist's Guide | 2017
- Book | Ruby & Sapphire | A Collector's Guide | 2014
- Book | Terra Spinel — Terra Firma | 2010
- Book | Ruby & Sapphire | 1997
- Book | Ruby & Sapphire Colors | From Peacock to Pigeon's Blood
- Book | Inside Out | GEM•ology Through Lotus-Colored Glasses | 2020
- Book | Jade | A Gemologist's Guide | 2022
- Sherlock • Inclusion Research
- 4 Treasures • Reference Search
- Book/Instrument Reviews
- Book Review | Photoatlas of Inclusions in Gemstones, Volume 3 | Lotus Gemology
- Book Review | Photoatlas of Inclusions in Gemstones, Volume 2 | Lotus Gemology
- Book Review | A Geologist Speculates | Lotus Gemology
- Book Review | Imperial Jade of Burma & Mutton-Fat Jade of India | Lotus Gemology
- Instrument Review | Presidium Synthetic Ruby Identifier
- Book Review | The Eduard Josef Gübelin Story: The Art and Science of Gems | Lotus Gemology
- Instrument Review | GemmoRaman-532
- Book Review | Ruby | 2017 | Joanna Hardy
- Book Review | Ruby, Sapphire & Spinel | An Archaeological, Textual and Cultural Study
- Book Review | Diamond | An Early History of the King of Gems
- Fine Images for Sale
- Lotus Bibliography
- Articles
- Contact