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This course is based is on materials science applied to heating ruby-sapphire at the intermediate level, is conducted by Ted Themelis. Topics range from heating rubies and sapphires with buffering and non-buffering reactions to heating with glass and flux technology. Industry members say that this is the best and the only hard-core course on the subject available in this planet.. Only serious and dedicated participants are considered to attend. Contact Ted Themelis ted@themelis.com
| Course # |
Dates-time |
Register |
Available: |
Status |
| #610-2025--9a |
Sept. 6-7, 2025, 9am-1pm |
OPEN |
| #610-2025-9b |
Sept. 8-9, 2025, 9am-1pm |
OPEN |
| #0910-2025-9c |
Sept. 15-16, 2025, 9 am-1 pm |
OPEN |
| LOCATION |
Bangkok, Thailand, Gemlab premise (near JTC gem market) |
| CLASS |
The course is limited to 5 persons |
| PREREQUITE |
Gemological knowledge with some science |
| EQUIPMENT |
Gemlab high temp. furnace M80-1700, Low temp. furnace V50-1300, Gemological miscoscope assigned for each person |
| REFERENCE |
Ted Themelis reference monographs No-1-7, No.9 |
| FEE |
USD 350 per person (non-refundable) |
| COURSE 610# SYLLABUS |
| DAY 1 (9am-1pm) |
Buffering, non-buffering reactions, Glass-flux heating tehcnology PP presentations. Material & equipment demonstration used in the heating process. Heating protocol. Load the for corundum. Class dismissed at 1pm to return next day. The heating process selected is executed at the lab overnight. |
| DAY 2 (9am-1pm) |
Uloading crucible, evaluation and examination of the heated corundum using gemological microscopes. |
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| NEW PUBLICATION (released June 2025): MONOGRAPHS No.1-7 THE HEAT TREATMENT |
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by Ted Themelis
Total 7 monographis+slipcase
530 pp. full color
Over 1010 color photos
Price:USD350 postpaid
Published: June 2025
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These monographs are written based on the fundamental structure of the previous editions of The Heat Treatment of Ruby- Sapphire, written and published by the same author in 1992, 2012, and 2019. This newest edition (June .2025) is presented in the form of monographs, aiming to provide the tools for understanding the heat treatment of ruby-sapphire, learning how to think alternatively, and producing new ideas that will ultimately formulate new models and exciting new inspirations.
MONO No.1. An intrroduction to the Heat Treatment of Ruby-Sapphire
MONO No.2. First Principles in Heating Ruby-Sapphire
MONO No.3. The Effect of Heat on Attributes of Ruby-Sapphire
MONO No.4. The Effect on Inclusions of Ruby-Sapphire
MONO No.5. Heat Treatment Parameters of Ruby-Sapphire
MONO No.6. Methodology of Heat Treating Ruby-Sapphire
MONO No.7. Equipment for Heat Treating Ruby-Sapphire |
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