Hue discrimination in jewellery appraisers exceeds normal performance

Area of Science:

• Ophthalmology
• Color Vision Science
• Vocational Testing

Background:

• The FM-100 Hue test is crucial for vocational assessments requiring precise hue discrimination, such as in jewelry appraisal.
• Accurate hue discrimination is vital for gemstone valuation, where minor errors can lead to significant financial discrepancies.

Purpose of the Study:

• To evaluate the Cone Contrast Test (CCT) as a potential predictor of performance on the FM-100 Hue test.
• To explore the CCT's utility as an alternative screening tool for jewelry appraisers.

Main Methods:

• Participants included 18 members of the National Association of Jewelry Appraisers (NAJA) aged 34-76.
• Color vision was assessed using the Ishihara test, FM-100 Hue, Lanthony Desaturated D-15, and the CCT.
• The FM-100 Hue was used for certification, while the CCT was investigated as a potential substitute.

Main Results:

• Cone Contrast Test (CCT) M and S cone scores significantly predicted FM-100 Hue total error scores (TES).
• A CCT score below 60 was indicative of performance 3 standard deviations below the mean TES in this cohort.
• Seventeen out of 18 appraisers exhibited TES scores significantly better than age-matched normal values.

Conclusions:

• The CCT may serve as an effective alternative to the FM-100 Hue for certifying jewelry appraisers.
• While promising, further comparative validation is needed before the CCT can be solely relied upon for certification.
• The exceptional hue discrimination observed may be attributed to perceptual learning from task-specific experience.