Thank you Mr. Tay. Fortunately, I got a full refund on the “pearls” and the judge ruling was based on your certificate. Thanks again for your help. (the pearls are plastic imitation pearl)

Mr. Werner Holzhauser, Germany

Please accept not only my genuine thanks, but also my enthusiastic congratulations on your latest results of interesting research of the chemical distinction between rubies from Burma and Thailand.

Edward Gubelin, Honorary Professor of the University of Stellenbosch, Switzerland

Mr. Tay had been most professional and most importantly, unbiased, in his inspection of diamonds and gemstones. It is indeed very hard to find someone of his calibre in Southeast Asia. Cheers to Mr. Tay Thye Sun

Mrs Julia Goh, Singapore

Excellent service by Mr Tay. Have in-depth knowledge of product. Great job and will introduce service to family and friends

Ms. Ting Lim, Singapore

His gem testing laboratory has ISO accreditation since 1998. Recognized throughout Asia for the integrity of his laboratory service, Mr. Tay has shared his gem laboratory research through numerous published articles, and as a guest speaker in Tokyo, Beijing, Idar-Oberstein, Taipei, Bangkok, Yangon, Kuala Lumpur and Bombay.

GIA GemFest 2000 (Leadership Presentations)

The sharing of your expertise and veiwpoints on the “Identifying Rubies by the PIXE technique” has been tremendous value to the participants…

Dr. Sunee Sriorathaikul, President Thai Gem and Jewelry Traders Association, Thailand