Understanding this purity table is the essential first step for anyone valuing silver jewelry, scrap silver, or bullion. The purity decimal system is straightforward: a purity of .925 means 92.5 parts pure silver per 100 parts of alloy. To calculate the per gram price for any purity, you multiply the fine silver per-gram price by that decimal. The remaining metal content — typically copper in sterling silver — adds structural strength but has negligible value compared to the silver content.
The table displays four unit columns because different silver markets use different conventions. The gram is the practical retail and scrap standard — most jewelry scales measure in grams to 0.01g precision. The troy ounce (31.1035 grams) is the global commodity market standard; every COMEX and LBMA quote is in troy ounces. The kilogram is the wholesale and industrial standard used by refiners, ETF custodians, and electronics manufacturers. Pennyweight (DWT) is the traditional jewelers' unit: 20 DWT equals one troy ounce, and many pawnbrokers and older jewelry appraisers still quote in DWT.
All four columns show the same underlying silver value expressed in different measurement scales — a 31.1035-gram piece of .925 sterling silver is worth exactly the same whether you quote it as a per-gram rate, a per-ounce rate, or a per-kilogram rate. The only difference is the number used. Knowing which unit a potential dealer is quoting prevents significant valuation errors, particularly on larger bar or flatware transactions.
One critical warning: items marked EPNS (Electro Plated Nickel Silver), Silver Plate, Sheffield Plate, or German Silver are not included in this table because they contain essentially no silver. The silver layer on electroplated pieces is measured in microns, not grams, and has no meaningful scrap value. Check your hallmark carefully before using any row in this table — look for .925, 925, STERLING, STER, .999, or the specific purity number stamped on the piece.