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Calculation of metal weights


The factors shown in the left hand column above will enable you to estimate given metal weight from either wax or another metal type.


  • A wax pattern of .32 gm for which an estimated weight in 18ct Yellow Gold is required:  .32 gms x 16.25 = 5.20 gms
  • An item weighing 4 gms in Stg.Sil. for which an estimated weight in 9ct Yellow Gold is required: 4 gms x (11.75/10.75) = 4.37 gms

NOTE: We find it is easier in use to convert back to wax and from there to the required metal type.


Working Example

  • Catalogue Pattern C1083 weighs 2.79 gms in Stg. Sil.
  • Divide by 10.75 to obtain a wax weight.
  • Multiply the wax weight by the figure from the above list which corresponds with your chosen metal.

e.g. wax weight .26 gms x 11.75 (9 Yg) = 3.06 gms.

Therefore design C1083 in 9 Yg will have an approximate weight of 3.06 gms

General Purpose Casting Alloys Specific Gravity Factor
Platinum 95021.24
Fine Gold19.36
22ct Yellow Gold18.12
18ct Pd White Gold16.59
18ct Yellow Gold16.04
18ct Pink Gold (H)15.45
14ct White Gold14.02
14ct Yellow Gold13.56
14ct Pink Gold14.00
9ct Pt White Gold13.04
9ct Yellow Gold11.64
9ct Pink Gold11.71
Fine Silver10.64
Bright Silver10.50
Sterling Silver10.55

14ct Green Gold
On Monday 14th November we will be casting 14ct GREEN GOLD. Try it for something a little different!!!
8 Nov 2011
JAA Australian Jewellery Fair - Brisbane
Brisbane Convention & Exhibition Centre, Brisbane, Australia Mar 12 - 13, 2011
10 Mar 2011
Melbourne Showroom Opens
Visit Apecs on the 3rd floor of the Manchester Unity Building, 220 Collins Street Melbourne
29 Sep 2005