John Chapman
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John Chapman has a degree in physics and has been active in the diamond industry for over 30 years with technical roles across the diamond pipeline from exploration to diamond grading. John has worked for Rio Tinto Diamonds for much of his career where he had a special interest in pink diamonds and initiated three PhD studies into the colored stones. He also developed machines for classifying rough diamonds and an instrument for color grading pink polished diamonds. In the past few years he has been director of Gemetrix Pty Ltd. which has developed and currently manufactures luminescence-based instruments to detect synthetic and treated diamonds. Besides also providing technical consulting services to the industry, he is chief editor for the Mediterranean Gemmological and Jewellery Conferences. John lives in Perth, Australia.


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The American Gem Society (AGS) is a nonprofit trade association of fine jewelry professionals dedicated to setting, maintaining and promoting the highest standards of ethical conduct and professional behavior through education, accreditation, recertification of its membership, gemological standards, and gemological research.

The Society is committed to providing educational products to inform and protect the consumer and to contributing to the betterment of the trade by creating industry standards to protect the jewelry-buying public and the fine jewelry industry as a whole.

AGS Laboratories, founded to support the AGS mission, is a nonprofit diamond grading laboratory with a mission of consumer protection. Adhering to the AGS Diamond Grading Standards, AGS Laboratories is dedicated to offering diamond grading reports that provide consistency and accuracy based on science.

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