Status: Founder Member
Business Type: Valuer in Private Practice

San Diego Gemological Laboratory serves the San Diego area with appraisals of diamonds, gemstones, fine jewelry and watches.

Services include reports for insurance, estate, equitable distribution as well as expert witness services and gemological consultation.

Your appraisal is performed according to the Uniform Standards of Professional Appraisal Practice (USPAP).

San Diego Gemological Laboratory is the only fully equipped and a Certified Laboratory (AGA) in San Diego County.

Thom Underwood is an accredited jewelry appraiser with over 32 years of experience in the jewelry appraisal profession and is the winner of the AGA's Antonio C. Bonanno Excellence in Gemology Award for 2012.

  • Graduate Gemologist - Gemological Institute of America
  • Fellow - Gemmological Association of Great Britain
  • Senior Member & Master Gemologist Appraiser® - ASA
  • Certified Senior Member - National Association of Jewelry Appraisers
  • Certified Gemological Laboratory - Accredited Gemologists Association
  • Winner of the AIJV Website of the Year Award 2012


Thom Underwood GG, FGA
San Diego Gemological Laboratory
1851 San Diego Ave
San Diego
CA 92110
United States of America
Telephone: 619-286-6614

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