Welcome to Gemlab Inc. at www.themelis.com

Established in 1975 by Ted Themelis and his family, Gemlab Inc. has remained committed in serving the gem trade industry representing a heritage of innovation, experience and trust for over 35 years. Gemlab provides diversified and broad range of products and services for the gem-jewelry industry. Our lab is equipped with state-of-the-art furnaces and related gem treatment equipment. We have in stock over 2,000 treated and untreated ruby & sapphire reference specimens from nearly all major mines of the world. Our company maintains a gemological data bank & image library of over 10,000 items featuring gems, minerals, gem-mining, gem-processing and related topics, specializing in Burma (Myanmar) gems and gem deposits. Our in-depth, diversified knowledge on these subjects enable us to offer expert consultation, solving your educational, technical and information problems.

Gem Training

Gem Bookstore

Gem Instruments

Gem Treating

Gem Sets

Events - Features - Calendar

Gem Sets Selected sets of untreated-treated gems for gemologists, ideal for teaching and research are sold directly from our lab. Buy directly from the source.

Gem Treatment Training Course Updated and unique "on-hands" lab course on gem treatments is presented by Ted Themelis in Bangkok Sept. 9-13, 2009. One seat available as of June 26 2009. Chick here for course description

Gemological LED Microscopes Gemlab's maxxiLEDscope and portaLEDscope represent the new generation of innovative gem stereo microscopes designed by Ted Themelis and fabricated at our facility in Bangkok. There is nothing like you have ever experienced before. MaxxiLEDscope (7.5-100X) List US$1795 complete; portaLEDscope (10-60X) List US$ 795. Details

BOOK: Gems and MInes of Mogok (Burma, Union of Myanmar) Buy your autographed copy of the book Gems & Mines of Mogok by Ted Themelis who actually did the pioneer field work on the geology, mineralogy and mining of the legendary Mogok (Burma, Union of Myanmar). This is the only complete work on the subject. View all book titles

Ted's thinking aloud: Gemologists and Origin reports It appears that there are two types of gemologists: "ordinary" and "elite". Both gemologists are usually graduated from famous (and not so famous) gemological schools (or by correspondence) serving the industry in two distinct levels. The ordinary gemologists are limited to gemological investigations based on classical gem instruments, meaning that they cannot issue gemstone origin reports because they do not have the analytical equipment needed. The elite gemologists work in the leading commercial gemological labs equipped with analytical instrumentation and their knowledge is superior from the ordinary gemologists. Moreover, they do not share their database.. Thus, ordinary gemologists will never become true gemologists. The other option is that the gem origin issue should be abandoned. Bear that in mind in your limitations before thinking to become a true and dedicated gemologist.

Gemologist's Education

For the gemologist who wants to learn!

Gem Adventures

Gem adventures of Ted Themelis to exotic and dangerous gem mining areas around the globe.

Industry Alert - News

Certain types of Pb-treated rubies are retreated by removing the old Pb-based additives and replacing with different additives; the appearance of the final product is stunning without showing the characteristic "flashes".