[Jewelry making - Article 00088] - Re: [Orchid] DWT not PWT

[Larry & Cathy Silva]

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Cindy,

    According to my encyclopedia: 

    Pennyweight is an obsolete unit of mass the same as 24 grains,
    1/240th of a troy pound, 1/20th of a troy ounce, or approx 1.555
    grams. 

    A penny coin was literally, as well as monetarily, 1/240th of a troy
    pound of Sterling Silver. 

    While "DWT" is the most common abbreviation for pennyweight (as "d"
    was the abbreviation for "penny" in the pre-decimalisation British
    system), some sources list "PWT" as an alternative. 

    The Roman currency system included the "denarius", a small silver
    coin as the most common coin in circulation. Hence the words
    "dinero" Spanish, "dinheiro" Portuguese and thus the "D" in the
    abbreviation for pennyweight. 

Lawrence Silva
Da Gama Designs
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