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<p>The coloration of garnets is governed by transition metal ions and crystal structure. This study established a rapid variety identification method for orange-red garnets based shifts in infrared absorption peaks. We quantified color parameters under standardized illuminants (D<sub>65</sub>, A, and F<sub>2</sub>) using the CIE 1976 L<sup>*</sup>a<sup>*</sup>b<sup>*</sup> space. The results revealed that the Mn/Fe ratio and Fe content critically modulate the hue angle (h<sup>°</sup>) of orange and red garnets. Illuminant A maximises chroma for red varieties, while F<sub>2</sub> light optimally displays orange-yellow garnets. D<sub>65</sub> provides a versatile source for routine identification and evaluation. This integration of crystal chemistry and colorimetry offers actionable strategies for optimising orange-red gemstone presentation.</p>

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Light source dependent colour perception in orange red garnets via spectroscopy and colorimetry

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月23日

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  • Meilin Zhu,
  • Pohsun Wang,
  • Ying Guo

摘要

The coloration of garnets is governed by transition metal ions and crystal structure. This study established a rapid variety identification method for orange-red garnets based shifts in infrared absorption peaks. We quantified color parameters under standardized illuminants (D65, A, and F2) using the CIE 1976 L*a*b* space. The results revealed that the Mn/Fe ratio and Fe content critically modulate the hue angle (h°) of orange and red garnets. Illuminant A maximises chroma for red varieties, while F2 light optimally displays orange-yellow garnets. D65 provides a versatile source for routine identification and evaluation. This integration of crystal chemistry and colorimetry offers actionable strategies for optimising orange-red gemstone presentation.