Gems & Gemology Lectures • Lotus Gemology Bangkok

Gems & Gemology Lectures from Lotus Gemology

Lotus Gemology's gemologists have lectured extensively about a wide variety of gemological topics including ruby, sapphire, jade, and more.

Gemology Lectures

Lotus Gemology gemologists have authored a number of books and more than 160 articles on all aspects of the gem and jewelry trades and traveled to scores of countries in search of precious stones. As a result, they are in great demand as speakers. Over the past forty years, Lotus Gemology gemologists have given more than 100 presentations around the world covering topics including ruby and sapphire, spinel, jade, gemstone origin determination, treatment determination, and more.

Lotus Gemology's Richard W. Hughes delivers a talk about connoisseurship of ruby and sapphire.


Popular Topics

Ruby & Sapphire: A Collector's Guide

For centuries rubies and sapphire have been among the most coveted of gemstones, and for good reason. From their natural creation to their cultural symbolism, we provide an overview the natural and cultural history of rubies and sapphires from around the world. We guide the audience with a connoisseur's eye, explaining what collectors should look for, and what to avoid. Find out why these alluring gems continue to be used as popular stores of wealth and are symbols of royalty to this day.

Inside Out: Journey into the Center of a Gem

Precious gemstones are celebrated for the outward beauty, particularly for shining colors that capture our attention. Beyond their fascinating beauty, each of Mother Nature’s gems encapsulates part of Earth’s history, a story millions of years in the making. Join us on a journey into this hidden space inside of a gemstone. Together we will explore the microscopic depths of rubies and sapphires, seeing a world that most have never glimpsed.

This topic is great both as a stand-alone lecture and as an introduction to microscopy workshops led by our gemologists.

Jade: China's Gift to the World

Jade has been treasured by the Chinese for some 8,000 years. Yù (玉), the Chinese word for jade, is one of the oldest in the Chinese language; its pictograph is distinguished from that for “ruler” only by one dot. Outside of China, people generally think of jade as the jadeite jade from Burma, where the finest quality is a vivid green. Within China, however, jade is a stone of an entirely different character, with the finest quality being white. Lotus Gemology offers a brief survey of the places jadeite and nephrite come from and then delve into the real Chinese jade, the true “Stone of Heaven.”

Sapphire Isle: Madagascar Sapphire

Over the past 25 years, no country in the world has produced as much fine sapphire as Madagascar. And yet this island's gems are still relatively unknown. Lotus Gemology gemologists have made multiple visits to the sapphire mines in Madagascar and will introducte the audience to this isle that has become one of the world's most important sources of gems. The lecture also covers the gemology of Madagascar sapphire and ruby, including the most important identifying features, and results from a series of experiments our laboratory has conducted on the heat treatment of Madagascar sapphire.

Let's Get Together

Interested in inviting our experts to speak at your event or conference? Our gemologists can custom-tailor a program to meet your group's requirements or deliver one of our popular favorites. Our presentations range from keynotes of less than an hour to full-day, hands-on workshops. This email address is being protected from spambots. You need JavaScript enabled to view it. with us and let's make it happen.

Recent & Upcoming Lectures

Click here to see our details of our recent and upcoming lectures.

Where We've Spoken

Our gemologists have spoken to a variety of audiences with all levels of expertise, from laypeople and students to leading industry professionals. Below are just some of the groups we have addressed in the past:


Cartier, Paris
Van Cleef & Arpels' L'Ecole School of Jewelry Arts


Bowers Museum
Denver Museum of Nature & Science
Houston Museum of Natural Science
Pacific Asia Museum (Pasadena, CA)


Tongji University

Organizations & Conferences

Academy of Valuers
Accredited Gemologists Association (AGA)

American Ceramic Society
American Gem Society (AGS)
AGTA GemFair Tucson & Las Vegas
Arusha Gem Fair
Asian Gemmological Institute and Laboratory (AGIL)
Asian Institute of Gemological Science (AIGS)
Bangkok Gems and Jewelry Fair
Canadian Gemmological Association
Copenhagen Gemmological Symposium
Columbia-Willamette Faceters' Guild
Conference on Radiation Effects in Insulators (REI)
Dallas Mineral Symposium
Fallbrook Gem and Mineral Society
Foreign Correspondents Club of Thailand (FCCT)
Friends of Mineralogy
Gem and Jewelry Institute of Thailand (GIT)
Gemmological Association of Australia (GAA)
Gemmological Association of Great Britain (Gem-A)
Gemmological Association of Hong Kong (GAHK)
Gemmological Association of New Zealand
Gemmological Association of Sri Lanka
Gemological Institute of America (GIA)
Gemstone Industry & Laboratory Conference (GILC)
Geoliterary SocietyGemmological Association of Sri Lanka
Gemological Institute of America (GIA)
Gemstone Industry & Laboratory Conference (GILC)
Geoliterary Society
GIA Alumni Association Chapters

  • Boston, MA
  • Columbus, OH
  • Detroit, MI
  • Houston, TX
  • Inland Empire (CA)
  • Los Angeles, CA
  • Phoenix, AZ
  • Portland, OR
  • Sacramento, CA
  • San Diego, CA
  • San Francisco, CA
  • Seattle, WA
  • Seoul, South Korea
  • Washington, DC

Gübelin Gem Lab
Hawaii Jewelers Association
Hong Kong Gem and Jewellery Fair
Hong Kong International Jewellery Show
International Colored Gemstone Association (ICA)
International Colored Gemstone Mines to Market Conference, Jaipur, India

International Gemological Conference (IGC)
International Society of Appraisers (ISA)
Mineralogical Society of Southern California
National Association of Jewelry Appraisers (NAJA)
Rendez-Vous Gemmologique de Paris
Republic of China Gemmological Association (Taipei, Taiwan, China)
San Diego Gem & Mineral Society
Scandanavian Gem Symposium
Scottish Gemmological Association
Siam Society

Sinkankas Symposium
Swiss Gemmological Society
Tahan Institute of Technology (Hualien, Taiwan, China)
Tiangong Jade Carving Awards (Suzhou, China)
Women's Jewelry Association (WJA)
Yangon International Gems & Jewellery Fair


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