is an ancient Japanese unit of weight, still used for cultured pearls. One momme equals 3.75 grams.
Unit of weight equivalent to 3.75 grams. Because most copper coins weighed this amount, the monetary unit (mon) and the weight (momme) were often used interchangeably.
mm = Momme a japanese method of measuring the weight of silk. 1 mm = approx. 3.6 grams per square yard. The higher the mm number, the heavier the silk.