Dispersion
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Definition
The separation of white light into its spectral colors as it passes through a gemstone, producing the rainbow-like 'fire' visible in faceted stones.
Detailed Explanation
白色光が宝石を通過する際にスペクトル色に分離される現象で、ファセット研磨された宝石に虹色の「ファイア」として視認されます。ダイヤモンドの分散値は0.044で特に高いことで知られています。