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Bangkok-based gem lab testing colored gemstones for origin, treatments and natural vs. synthetic
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- Enhanced Emeralds/Madagascar Sapphire
- Madagascar Sapphire
- From Madagascar to Malysheva
- Gem Hunting in Central Asia
- From Madagascar to Tajikistan
- Jade | Stone of Heaven
- People & Places | New Directions in GEM•ology
- Jade | Stone of Heaven
- People & Places | New Directions in GEM•ology
- People & Places | New Directions in GEM•ology
- Lecture | People & Places | Bangkok | 9 July 2008
- Lecture | Hunting gems in Southern Tanzania | Bangkok | 9 March 2009
- Jade | Stone of Heaven
- Humanistic Gemology
- Gemological Heresies
- Heaven Below | Jaipur, India
- Andesine | A Panel Discussion
- People & Places | New Directions in GEM•ology
- Jade | Stone of Heaven
- Padparadscha Sapphire
- Mogok | Valley of Rubies
- Padparadscha Sapphire
- Ruby & Sapphire | A Collector's Guide
- Ruby & Sapphire | A Collector's Guide
- Ruby & Sapphire | A Collector's Guide
- Gemological Heresies
- Gemological Heresies Part 2
- Ruby & Sapphire — A Collector's Guide
- Ruby Inclusions
- Mogok Ruby
- Gemological Heresies
- Ten Thoughts on Gemology
- Gemological Heresies
- Ruby & Sapphire | A Collector's Guide
- Padparadscha Sapphire
- Mogok Ruby
- Ruby & Sapphire | A Collector's Guide
- Gemological Heresies
- Ruby & Sapphire | A Collector's Guide
- Ten Thoughts on Gemology
- Ruby & Sapphire | A Collector's Guide
- Ruby & Sapphire | A Collector's Guide
- Ruby & Sapphire | A Collector's Guide
- Sapphire Around the World
- Madagascar | Sapphire Isle
- Ruby Inclusions
- Ruby & Sapphire | The Secret World
- Seeing Red | Ruby
- Gemological Heresies
- Ruby Inclusions
- Madagascar | Sapphire Isle
- Seeing Red | Ruby
- Gemological Heresies
- Jade | China's Gift to the World
- Gem Color Types
- Seeing Red | Ruby
- Jade | China's Gift to the World
- Ruby & Sapphire | A Collector's Guide
- Gem Color Types
- Journey to the Center of the Gem
- Jade | China's Gift to the World
- Journey to the Center of the Gem
- Ruby & Sapphire | A Collector's Guide
- Jade | China's Gift to the World
- Jade | China's Gift to the World
- Jade | China's Gift to the World
- Jade | China's Gift to the World
- Ruby | Seeing Red
- Madagascar | Sapphire Isle
- Ruby & Sapphire | A Collector's Guide
- Jade | China's Gift to the World
- Jade | China's Gift to the World
- Jade | China's Gift to the World
- Madagascar | Sapphire Isle
- Inside Out: Journey into the Center of a Gem
- Microscopy & Photomicrography
- Jade | China's Gift to the World
- Jade | China's Gift to the World | Copenhagen
- Jade | China's Gift to the World
- A Canary in the Ruby Mine
- A Canary in the Ruby Mine
- Jade | A Workshop
- Jade | A Workshop
- A Canary in the Ruby Mine
- Greasy Business | Oiled Gems Fraud
- Jade | China's Gift to the World
- Greasy Business | Oiled Gems Fraud
- The Mystery of Inclusions | A Panel Discussion
- Earth's Time Capsule | Inclusions in Colored Gems & Diamonds
- Inside Out | Journey into the Center of a Gem
- A Canary in the Ruby Mine
- Meet the Extraordinary 40 — Richard Hughes Honored by Jewellery News Asia
- Seeds and Carats
- Broken Bangle | The Blunder Besmirched History of Jade Nomenclature
- Broken Bangle | The Blunder Besmirched History of Jade Nomenclature
- Broken Bangle | The Blunder Besmirched History of Jade Nomenclature
- Inside Out | Journey into the Center of a Gem
- Inside Out | Journey into the Center of a Gem
- A Canary in the Ruby Mine
- Jade | China's Gift to the World
- Trick or Treatment
- Describing Color in Gems | A Fool's Guide
- Welcome to Rubyland
- Trick or Treatment
- Inside Out | Journey into the Center of a Gem
- Welcome to Rubyland
- Broken Bangle | The Blunder Besmirched History of Jade Nomenclature
- Madagascar Sapphire
- Hyperion — Siamese Twins
- Describing Color in Gems | A Fool's Guide
- Describing Color in Gems | A Fool's Guide
- Nature, Nurtured | The History of Ruby & Sapphire Treatment
- Thanks
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- 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
- Inside Out — Gem Inclusions & the Symmetry of Crystals
- 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
- Fluxed Up — The Fracture Healing of Ruby
- 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 (Spinel) — Blood-Red Souvenir of Conquest
- 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
- From Russia with Jade — Russian Fei Cui Deposits
- 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
- Squeezing Sapphire — Heat-Treating Corundum With Pressure
- Hidden Treasure — Collecting the Literature of Jade
- Spinel Inclusions — An Exercise in Aesthetics
- Ruby & Sapphire (Corundum) Inclusions — Lotus Gemology's Crystal Registry
- Choosing the Best Colored Gem Testing Lab
- Madagascar Ruby & Sapphire — Ruby & Sapphire — A Gemologist's Guide
- Madagascar Sapphire — Low-Temperature Heat Treatment Experiments
- Auctions & Press • Lotus Gemology in the News
- 2020 World Sapphire Market Update – 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's Stone
- Hidden Treasure — Collecting Books on Ruby & Sapphire
- Oiled Spinel & Tanzanite — Shocking Revelations
- Made You Look — 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
- 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
- 'Accurate Improv' — A Bit of ChatGPT Gold
- Con-juring Ruby — A Heated Flux Synthetic
- The Gemologist's Core Library — Classic Books on Gemology, Jewelry and Mineralogy
- Reference Books on Gemology, Jewelry and Mineralogy
- Green Fire — Lotus Gemology's Guide to the Literature of Emerald
- An Alexandrite-Emerald Intergrowth, Reportedly from Russia
- Al-Bīrūnī — The GGOAT?
- Books
- Corundum | 1990
- The Book of Ruby & Sapphire | 2012
- Ruby & Sapphire (Corundum) | 1992
- Broken Bangle — The Blunder-Besmirched History of Jade Nomenclature | 2024
- Nephrite and Jadeite by Heinrich Fischer — English Translation of his 1875 Classic — 2025
- Ruby & Sapphire — A Gemologist's Guide | 2017
- Ruby & Sapphire — A Collector's Guide | 2014
- Terra Spinel — Terra Firma | 2010
- Ruby & Sapphire | 1997
- From Peacock to Pigeon's Blood — Ruby & Sapphire Colors | 2017
- Inside Out — GEM•ology Through Lotus-Colored Glasses | 2020
- Jade — A Gemologist's Guide | 2022
- Sherlock • Inclusion Research
- Four Treasures • Reference Database
- Book/Instrument Reviews
- Book Reviews
- Book Review | Photoatlas of Inclusions in Gemstones, Volume 3 (2005)
- Book Review | Photoatlas of Inclusions in Gemstones, Volume 2 (2005)
- Book Review | A Geologist Speculates (2014)
- Book Review | Imperial Jade of Burma & Mutton-Fat Jade of India (2014)
- Book Review | The Eduard Josef Gübelin Story (2014)
- Book Review | Ruby by Joanna Hardy (2017)
- Book Review | Ruby, Sapphire & Spinel — An Archaeological, Textual and Cultural Study (2016)
- Book Review | Diamond | An Early History of the King of Gems (2018)
- Instrument Reviews
- Book Reviews
- Fine Images for Sale
- Lotus Bibliography
- Articles
- Contact
Hidden Menu
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- Other Articles
- Book | Ruby & Sapphire | A Collector's Guide | 2014 | Order Page
- Book | Ruby & Sapphire | A Gemologist's Guide | Order Page
- Book | Jade | A Gemologist's Guide | Order Page
- Book | Jade | A Gemologist's Guide | Limited Edition Order Page
- Book | From Peacock to Pigeon's Blood | Order Page
- Lotus Image Galleries
- Book | Inside Out | Gemology Through Lotus-Colored Glasses | Order Page
- Book | Broken Bangle — Jade Nomenclature Order Page
- Book | Heinrich Fischer's Nephrite and Jadeite
- Hyperion Test