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Updated: Jan 1, 2026

Scattering And Absorption of Light in Planetary Regoliths
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Metameric effects on peridot by changing background color.

Jun Tang, Ying Guo, Chang Xu

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |December 25, 2019
    PubMed
    Summary

    The Munsell N9 background is most effective for grading peridot color under fluorescent light. This research identified optimal grading levels for peridot, considering background influences on its yellowish-green hue.

    Area of Science:

    • Gemology
    • Color Science
    • Materials Science

    Background:

    • Peridot's yellowish-green color is influenced by ferrous iron (Fe2+), lighting conditions, and background.
    • Effective peridot color grading requires understanding background impacts.

    Purpose of the Study:

    • Determine the most effective background for peridot color grading under a 6504K fluorescent lamp.
    • Analyze the color effects of various gold alloy and Munsell neutral gray backgrounds.

    Main Methods:

    • Studied 95 gem-quality peridot samples from diverse locations.
    • Utilized electron probe microanalysis and spectrophotometry.
    • Applied Munsell neutral gray and standard gold alloy backgrounds.
    • Employed K-means clustering and Fisher discriminant analysis for color grading.

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    Main Results:

    • Munsell neutral gray backgrounds, particularly N9, proved most effective for peridot color grading.
    • Evaluated color effects across 24K, 22K, 20K, 18K, and 16K gold alloy backgrounds.
    • Graded peridot colors into Fancy Intense, Fancy Deep, and Fancy levels using the N9 background.
    • Observed a color level reversal phenomenon between Munsell N7 and N9 gray backgrounds.

    Conclusions:

    • The Munsell N9 background is recommended for consistent peridot color grading under specific lighting.
    • Understanding background-color interactions is crucial for accurate gemological assessment.
    • Further consideration of background variations is necessary for precise peridot classification.