Specific Gravity
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Definition
The ratio of a gemstone's weight to the weight of an equal volume of water at 4°C, providing a density measurement that is unique to each gem species.
Detailed Explanation
4℃の同体積の水の重量に対する宝石の重量の比を指し、各宝石種に固有の密度測定値として識別に利用されます。静水力学天秤や重液を使用して測定されます。