Play-of-Color
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Definition
The spectacular display of spectral colors flashing across the surface of precious opal as the viewing angle changes, caused by the diffraction of light by a regular lattice of microscopic silica spheres.
Detailed Explanation
貴オパールの表面に微細なシリカ球の規則的な格子による光の回折によって生じる現象で、観察角度の変化に伴ってスペクトル色が鮮やかに閃光します。オパールの価値を決定する主要な要素です。