Ted A. Irwin


  • Graduate Gemologist (G.G.), Gemological Institute of America
  • Independent Certified Gemologist Appraiser (I.C.G.A), American Gem Society
  • Accredited Senior Gemologist, Accredited Gemologists Association
  • Member, National Association of Jewelry Appraisers
  • Member, Association of Independent Jewellery Valuers
  • Member, American Society of Jewelry Historians
  • Member, Scottish Gemological Association
  • Insurance Producer’s License State of Washington
  • Bachelor of Arts, Business Administration, University of Puget Sound


  • President, Northwest Gemological Laboratory, Inc. (NGL), an independent laboratory for the appraisal for fine jewelry and gemstones.
  • Media consultant for consumer advocacy on gemstones and jewelry scams – appearing in segments aired on CBS Evening News, This Morning, local affiliates KIRO and KING TV. Expert panel discussion on diamonds, KIRO radio, gemological expert, Antiques Road Show, PBS.
  • Expert testimony in jewelry and gemstone matters at trial and through deposition.
  • Estimated articles appraised: 200,000+
  • Several hundred appraisal clinics
  • Director, Northwest Gemological Institute, L.L.C. (NGI), school of gemology and period jewelry.
  • Instructor, developer of gemological courses open to the trade and public including Diamond Grading, Gemstone Identification, Gemstone Evaluation, Opals, Jade and Precious Metals, corporate training nation-wide. Host of the Northwest Jewelry Conference, an annual multi-speaker gathering for period jewelry enthusiasts.
  • American Gem Society – Appraisal Standards, Education, Gemological Sciences committees
  • Accredited Gemologists Association – Board of Governors, Conference Committee Co-chair

See “Recent Events” listing for recent trade participation.

Revised 3/2019