Jeffery’s formal gemmological training was accomplished at SSEF, the prestigious Swiss Gemmological Institute in Basel, Switzerland where he successfully completed and passed requisite exams for his Basic (BGC), Diamonds (BDC), Advanced Pearls, Advanced Colored Stones & Scientific Gemmology courses.


With five decades of broad-based gem and jewelry trade experience, Jeffery is uniquely qualified as a consultant and an independent 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 from 20,000 THB

Single Fine Jewelry Item Retail Appraisal from 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