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RAPAPORT... Joseph Tenhagen passed away on April 27 at the age of 79, ending a 40-year legacy as an accomplished appraiser and consultant to the gem trade and jewelry industry. He attended the University of Miami as a geology major and later, in 1969, earned his Graduate Gemologist diploma from the Gemological Institute of America (GIA). That same year he earned his Fellowship FGA diploma from the Gemmological Association of Great Britain. 
From 1981 to 1984, he was president of the Accredited Gemologist Association. Tenhagen earned is Master Gemologist Appraiser title from the American Society of Appraisers from 1983 to 1995. Tenhagen joined the National Association of Jewelry Appraisers (NAJA) in 1992 and served as its associate director when Dr. James Jolliff was executive director as well as with the current executive director, Gail Brett Levine. Tenhagen published the “Diamond Value Index” from 1995 to 1998 and he was also on the editorial advisory board for the "Precious Stones Newsletter," where he contributed articles, and he published many articles in "Gems & Gemology," "Lapidary Journal" and NAJA’s "The Jewelry Appraiser." His participation in organizations and professional societies was equally prodigious as a frequent panelist and presenter at GIA Symposiums, ASA and NAJA. He was a charter member, past president and past secretary of the Diamond Dealers Club of Florida until 2005. He is survived by his wife, Mary, his son Tom and his wife, Theresa, and two grandchildren, Beverly and Joey.
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