Jeffery’s formal gemmological training was accomplished at SSEF, the prestigious Swiss Gemmological Institute in Basel, Switzerland where he successfully completed his Basic, Diamonds, Advanced Pearls, Advanced Colored Stones and Scientific Gemmology courses qualifying him as a Certified Scientific Gemologist – SSEF SGC. He is also a Senior Accredited Gemologist voting member of the AGA – Accredited Gemologists Association.


With five decades of broad-based gem and jewelry trade experience, Jeffery is uniquely qualified as a consultant and an independant appraiser. As such he has performed in-depth consultations on behalf of investors, and has generated appraisals for both private and corporate clients.

Single Fine Gemstone Retail Appraisal   -  20,000 THB

Single Fine Jewelry Item Retail Appraisal - 30,000 THB

Standard processing time 5-10 working days

Expedited 2 working days service add 50% to standard price

URGENT 1 working day service add 100% to standard price

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Shakiso Co., Ltd. DBA

Eighth Dimension Gems

501 Sita Building

 388 Mahaesak Road, Silom, Bangrak  

 Bangkok 10500 Kingdom of Thailand                      +66-86-418-0199