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Hallmarks
Here is a list of typical hallmarks used to identify metal purity
Typical metal hallmarks
This image shows the typical number hallmark used to state the purity of the metals commonly used in jewellery making.
Periodic table numbers.
Platinum 78 Pt
Gold 79 Au
Palladium 46 Pd
Silver 47 Ag
Other helpful tips
Gold can be marked with the purity number followed by K, KT or CT
Platinum can be marked with the purity number followed by Plat or PT
Just to confuse the issue German silver is also marked 835 or 900
Silver can be marked with st, stg, stirling, sil,
Stainless steel can be marked 304, 316, 430
Pat. Pend, means patent pending.
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