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Metal Weight Factors

To find the weight of a given object in a different metal than it is now, multiply by the factors shown. For instance: if you have a sterling ring that weighs 6 dwt (known) and want to know its weight in 18K yellow gold (query), then 6 x 1.48 = 8.8 dwt.

Query Known Factor
18KY Gold 18KW 1.064
  platinum 0.723
  brass 1.885
  sterling 1.48
14KY Gold 18KW 0.842
  14KW 1.035
  platinum 0.609
  brass 1.589
  sterling 1.248
10KY Gold 18KY 0.745
  14KW 0.884
  platinum 0.539
  brass 1.406
  sterling 1.104
Platinum palladium 1.758
  iridium 0.953
  10% irid plat 0.995
  15% irid plat 0.993
  rhodium 1.717
  ruthenium 1.771
  sterling 2.046
Sterling fine silver 0.984
  coin silver 1.004
  18KY 0.675
  14KY 0.801
  10KY 0.905
  platinum 0.488
  brass 1.273


From Tim McCreight's The Complete Metalsmith, with permission.