A measure of Troy weight equalling 24 grains or the twentieth part of a Troy ounce (there are 12 ounces in a pound Troy). Pennyweight is usually abbreviated dwt.
Pennyweights to Stones
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The stone is a unit of weight in the imperial system used informally in the UK and Ireland, almost exclusively as a measure of body weight. Although sanctioned by the EU for use as a supplementary unit it is essentially obsolete outside the UK and Ireland.