Developed at Columbia University by LeGrand Hardy, MD, Gertrude Rand, PhD, and M. Catherine Rittler, BA, with the assistance of several well-known color vision experts, the HRR 4th edition Pseudoisochromatic Test for color deficiency screening has improved diagnostic accuracy through the use of updated color vision genetic information and state-of-the-art printing methods. This test will indicate if there is a color perception deficiency that could affect color judgment.
Recommended for all professional appraisers or anyone engaged in the purchase, evaluation, or valuation of colored gemstones or fancy colored diamonds, the Colorvision Screening is a requirement of all Certified Gemologist Appraisers of the American Gem Society.
Colorvision is available at AGTA Tucson, AGS Conclave, JCK Las Vegas and American Gem Society Headquarters in Las Vegas.
Please contact firstname.lastname@example.org to schedule a screening or
call 866.805.6500 ext 1034 for an appointment.