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Acknowledgements

We would like to thank all the persons and institutions who helped for this report. Dr. A. Burkhardt for ED-XRF analysis, Prof. K. Ramseyer (University of Berne) and Dr. J. Mullis for cathodoluminescene analysis, Mrs Kathrin Hameter (co-worker in the group of trace elements and micro analytic of LAC laboratory at ETH (Zurich) for LA-ICP-MS analysis) and Mrs Anong Kanpraphai for Digital Imaging, both from GRS (Thailand) Co. LTD, M. Duggelin and D. Mathys from the ZMB laboratory (University of Basel, Switzerland) for Scanning Electron Microscopy, IMAGIMAX Animation & Design Studio (Bangkok, Thailand) for graphic and artwork, Mr. Saleem Michael for scientific graphics and preparing this report for the Internet (www.padparadscha.info) and Marcus Brogden for English corrections and Lewis Allen for some editorial work. Without the support of the trade including various wholesale companies in Bangkok and mining companies world-wide, it would not have been possible to receive enough reference materials. Thanks also to the companies in Bangkok and Chantaburi (Thailand) for heat treating our reference samples with the new method in their factories. This report was also supported by K.V. Gems Co. LTD, Chiaraput Gems Factory Co. LTD and the Thai Gems and Jewelry Trader Association (TGJTA).