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 Screening is available at conclave each year and American Gem Society Headquarters in Las Vegas. Please contact the AGS education department for a list of other screenings. To make an appointment, please contact us at firstname.lastname@example.org.