Grain (gr) [2]
Grain (gr) [2] :
A unit of weight formerly used by jewelers in measuring diamonds and other precious stones. The jeweler's grain is exactly 1/4 carat. Now that the carat has been standardized at 200 milligrams, the jeweler's grain is exactly 50 milligrams, or approximately 0.7716 troy grain. This unit is widely used for measuring pearls, so it is sometimes called the pearl grain
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