American Institute of Gemological Research, Inc.

independent jewelry appraisers serving the Denver metro area

Schedule an appraisal:     303-420-2369  •  888-420-2369  •

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About Us  

What is AIGR and when was it founded?
What services does AIGR provide?
What companies have been AIGR's clients?
Who performs AIGR's services?

What is AIGR and when was it founded?

AIGR was founded in February of 1979 as an independent gemological laboratory devoted solely to jewelry appraisals, gemological research, and monetary evaluation of gems and fine jewelry. All evaluations are backed by a micro-chemical analysis and state-of-the-art instrumentation.

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What services does AIGR provide?

AIGR performs gem identification, micro-chemical analysis, grading and classifying of gemstones, and micrography among other specific services.

Please call us at 303-420-2369 or 888-420-2369 or e-mail us at to schedule an appointment at one of our locations. We are generally available on weekday afternoons.

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What companies have been AIGR's clients?

AIGR is currently providing or has provided gemological services for the following companies:

  • Biondi Diamond Jewelers
  • Purvis Jewelers
  • Jay Feder Jewelers
  • Oster Jewelers
  • Molberg's Jewelers
  • Jared the Galleria of Jewelry
  • Zales Jewelers
  • Slovaks Jewelers
  • Jade House (jade importer and retailer)
  • Ron Pingenot (stone cutting, wholesale)
  • Kay Jewelers
  • Reeds Jewelers
  • Hearts Jewelers
  • Marquise Diamond Centers
  • Pan Pacific Investments
  • Marvin Dash & Co.
  • Friedlanders of Seattle
  • Charles Anthony Diamond Investments
  • Overland Gems
  • Bailey Banks & Biddle Jewelers
  • Fred Meyer Jewelers
  • Santa Barbara Municipal Court System (professional witness)
  • Allstate Insurance Co.
  • Commercial Union Insurance Co.
  • State Farm Insurance Co.
  • Jefferson County Court System (professional witness)

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Who performs AIGR's services?

AIGR's graduate gemologists have diplomas from the Gemological Institute of America.

Warren Pressler

View Warren D. Pressler's LinkedIn profile View Warren D. Pressler's LinkedIn profile
  • Received Independent Certified Gemologist Appraiser (ICGA) designation from American Gem Society (AGS), 2016 (This designation was received upon passing an exam covering the legal aspects of different types of appraisals in the court system.)
  • Successfully completed testing with AGS for Certified Gemologist (CG), 2015
  • American Gem-trade Association (Nomenclature)
  • National Association of Jewelry Appraisers, June 1, 1982
  • Graduate Gemologist, GIA, November 6, 1978
  • Colored Stone Grading Course, GIA, October 7, 1976
  • Diamond Grading and Evaluation, GIA, November 18, 1976
  • General Education Pierce College, 1972-74
  • Completion of McBeth Color Science Colorimetery & Spectrophotometry
  • Completion of Hue Discrimination and Color Vision Testing

Melinda Pressler

View Melinda Pressler's LinkedIn profile View Melinda Pressler's LinkedIn profile
  • Graduate Gemologist, GIA, April 2006
  • Gem Identification, GIA , March 2006
  • Colored Stones Course, GIA , May 2004
  • Diamonds Graduate, GIA, October 2003
  • Assistant appraiser for AIGR, since July 2002
  • General Education with an emphasis in Accounting, Metropolitan State College of Denver, 1999-2002
  • General Education with an emphasis in Comparative Literature, Brigham Young University, 1978-1979

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© 2018 AIGR, Inc. Last update: November 30, 2017