The American Gem Registry Inc. is a full-service gemological laboratory and jewelry appraisal service. Based in Denver, Colo., it renders appraisal services, diamond grading, gemstone services and authentication services. The firm does appraisal work for insurance replacement, retail comparison, fair market value, estate valuation, damage claims, charitable contribution and other purposes. The laboratory is fully accredited by the International Society of Appraisers, the American Gem Society and by the National Association of Jewelry Appraisers. The American Gem Registry Inc. is a Better Business Bureau (BBB) accredited firm.