Refractive Index
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Definition
A numerical value expressing how much a gemstone bends light as it passes through the stone, calculated as the ratio of the speed of light in a vacuum to the speed of light in the gem.
Detailed Explanation
真空中の光速と宝石内の光速の比として計算される数値で、宝石による光の曲がり具合を表します。宝石の識別において最も重要な特性値の一つで、屈折計で測定されます。