The sharing of your expertise and veiwpoints on the “Identifying Rubies by the PIXE technique” has been tremendous value to the participants…
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
Excellent service by Mr Tay. Have in-depth knowledge of product. Great job and will introduce service to family and friends
His gem testing laboratory has ISO accredition 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.
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)
Dependable assessment of diamond purchased on-line, found to be chipped at the culet. Fortunately, based on this assessment, the retailer agreed to a full refund.