Troy weight A grain is 20 mites, a mite is 24 droits, a droit is 20 perits, a perit is 24 blanks. In Scotland, the Incorporation of Goldsmiths of the City of Edinburgh used a system in multiples of sixteen. ("See Assay-Master's Accounts, 1681–1702, on loan from the Incorporation to the National Archives of Scotland".) Thus, there were 16 drops to the troy ounce, 16 ounces to the troy pound, and 16 pounds to the troy stone. The Scots had several other ways of measuring precious metals and gems, but this was the common usage for gold and silver. The Pound was
Pennyweight the alternative drams and grains measurement has been used since a new set of scales was purchased by the Egton Bridge Old Gooseberry Society in 1937. As of 2018, the world record for the heaviest gooseberry of 41 dwt 11 gr was held by Kelvin Archer of Cheshire. The most common abbreviation for pennyweight is "dwt"; "d", for the Roman "denarius", was the abbreviation for "penny" before Decimalization of the British monetary system. Alternate abbreviations are "pwt" and "PW". Although the abbreviations are the same, the pennyweight bears no relation to the weight of the American penny nail. That name