Mr. Tenhagen is the President Tenhagen Gemological Laboratory and has expertise in grading and appraisals of gems and jewelry. Mr. Tenhagen has extensive experience in performing appraisals for Individuals, Jewelers, Estates, Banks, Attorneys, Federal Bureau of Investigation, Department of Treasury, Securities and Exchange Commission, Internal Revenue Service, FDIC, and Insurance Companies.
Background
Q: Please list your professional accreditations, degrees, licenses, and certificates granted:A: University of Miami at Coral Gables, Florida, Geology Major, Chemistry Minor
Gemological Institute of America, G.G., Graduate Gemologist Diploma, 1969
Gemmological Association of Great Britain, F.G.A., Fellowship Diploma, 1969
National Association of Jewelry Appraisers, N.G.J.A., Senior member 1992 to present, Associate director 1993 to present
American Society of Appraiser, A.S.A. Senior member, 1983 to 1995, Recertified July 1991. Master Gemologist Appraiser, M.G.A., 1983 to 1995
Q: Please list your affiliations or memberships in any professional and/or industry organizations:
A: The Second and Third International Gemological Symposium 1991 and 1999, Sponsored by the Gemological Institute of America. Panelist and speaker at the session: ìEvaluation, Appraisals, Ethical and Legal Questionsî 1991 and ìAppraisal War Roomî 1999.
Diamond Bourse of Southeast United States Inc., Charter member, Past President, Past Secretary
National association of Jewelry Appraisers: Associate director and Instructor
American Society of Appraiser, Senior Member 1983 to 1995.
Co-Chairman of the International Board of Examiners, Gems & Jewelry Specialty 1986 1994.
Chairman, Gems & Jewelry specialty 1986-1991.
Co-Course Designer and Teacher, Master Gemologist Appraiser Course 1983-1984, 1987-1994.
President of the Accredited Gemologists Association, 1981-1985.
Vice President, Accredited Gemologists Association, 1980.
Director of Gemology, Academy of Fine Jewelry, Hollywood, Fl. 1980-1981.
Gemological and Appraisal Teaching Experience:
National Association of Jewelry Appraisers Miami Shores Community Center
Museum of Science and Planetarium Miami Jewelry Institute
American Society of Appraisers Academy of Fine Jewelry
Broward Community College
Member Dade County Youth Fair, Co-Superintendent of Minerals, Gems & Jewelry Dept., 1979-Present.
Assists various law enforcement agencies on Gem theft, recovery, and Appraisals and Identifications.
Experienced expert witness in numerous court cases, Federal, State, and Local courts.
Annual attendance and speaker at seminars and workshops on Gemology, Appraising, and the latest
Gemological developments and equipment, Jewelry and Appraising Associations, Jewelry, Gem related
Trade Shows
