Guild Laboratories Inc

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Since 1980, Guild Laboratories, in Los Angeles, CA has been the most relied upon source for securing expert gemstone grading, gem identification and independent appraisal and valuation for diamonds, gemstones, jewelry and currency.
Guild Laboratories president Charles Carmona, GG ASA has built this reputation by delivering fair and impartial valuation reports and consultation backed by decades of research and appraisal experience.

This thoroughly comprehensive manual does the difficult task of estimating carat weights of mounted gemstones, calculated by their dimensions and shape, with over 300 pages of tables listed, and gemstone type.

Guild Labs' President and Founder is often a featured expert jewelry & coin appraiser in TV news shows and documentaries, such as the Travel Channel. In the clip left, he discusses the process for setting up the US Treasury Auction for jewelry and coins.

Guild Laboratories is a trusted source for all of your gemological needs.
With decades of experience, we provide the highest quality appraisal services for diamonds and gemstones, jewelry, coins, and decorative art objects.
We offer consultation services, and provide experienced expert witness and litigation support to private and governmental agencies. See our SERVICES page to review our complete schedule offered at Guild Laboratories.

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Guild Labs Inc., 550 S. Hill St. #1188, Los Angeles, CA 90013

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