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Thom Underwood IMJVA

San Diego Gemological Laboratory is a Certified Laboratory with the Accredited Gemologists Association. In addition, Mr. Underwood earned and maintains the highest credentials and is a member of six professional appraisal and gemological organizations

San Diego JVA Registered Valuer ®


Unbiased Valuations of Diamonds, Gemstones, Watches, Pearls and Jewelry

We do not buy or sell jewelry, gemstones or precious metals affording you a truly unbiased appraisal. Your jewelry appraisal is performed according to the Uniform Standards of Professional Appraisal Practice (USPAP).

Appraisals While You Wait

Whenever possible examination and necessary tests are performed while you watch. Your appraisal is a bound report and includes a full description, a digital image and a plot of all diamonds over half a carat.  A pdf of the report is available on request.


Active in the jewelry industry since the mid 1970's, Thom began as a goldsmith and jewelry manufacturer. He opened San Diego Gemological Laboratory in 1978. Starting in 1981 Thom transitioned his manufacturing company into a fine jewelry store, Currie & Underwood situated in the Mission Hills community of San Diego. In 1991 Thom sold his interest in Currie & Underwood and has since focused on independent jewelry appraisal services.

Onsite booking is available for significant assignments.

Contact Details

tel 619-286-6614