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Grading

Dr. William Hanneman, known for his many contributions to gemology including creating a line of affordable instruments, died last month at the age of 93. He is pictured here at left with his friend Alan Hodgkinson, also an award-winning gemologist.

William Hanneman, a Gemologist Who Made His Field Affordable, Dies at 93

A pillar of the community, he used his chemistry degree and analytical mind to teach himself gemology and then create a line of affordable instruments.

Latest News

July 5, 2019

Priced at $5,999, the portable Varna-D color-grades polished diamonds of various sizes and shapes from D to L.

June 25, 2019

The two and a half-day session will teach students to determine how jewelry is made using forensic methodology.

June 19, 2019

The funds will go to Diamond Council of America graduates for continued education at the institute.

June 14, 2019

Lab President Debbie Azar called the discovery “atypical.”

May 30, 2019

The reports, which also include the full four Cs, were introduced earlier this year.

May 22, 2019

The stone is 0.64 carats and graded as a fancy grayish-greenish blue.

May 14, 2019

The Swiss gem lab has, for the first time, radiocarbon age-dated a historic natural pearl.

May 14, 2019

The London-based gemological lab is offering a mobile lab service, sending grading professionals straight to retailers and manufacturers.

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