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Composition of precious metal alloys

Overview of the three most common alloys found in gold jewellery

333 jewellery gold585 jewellery gold750 jewellery gold
33.3% gold content
The remaining components are normally silver and/or copper.
58.5% gold content
The remaining components are normally silver and/or copper.
75.0% gold content
The remaining components are normally silver and/or copper.

Overview of gold alloys

StampsGold contentRemarks

333/8ct

33,3 %

Other components are mostly copper, silver, nickel. Depending on the respective percentages, yellow gold, red gold or white gold is formed.

375/9ct

37,5 %

Other components are mostly copper, silver, nickel. Depending on the respective percentages, yellow gold, red gold or white gold is formed.

585/14ct

58,5 %

Other components are mostly copper, silver, nickel, palladium. Depending on the respective percentages, yellow gold, red gold or white gold is formed.

750/18ct

75 %

Other components are mostly copper, silver, nickel, palladium. Depending on the respective percentages, yellow gold, red gold or white gold is formed.

900

90 %

 

916/22ct

91,6 %

 

986

98,6 %

Gold ducat

999

99,9 %

Pure gold

Other stamps and hallmarks

StampsMeaningMost common use

90

only silver-plated

Common on silver-plated silverware.

100

only silver-plated

Common on silver-plated silverware.

plated

gold-plated/silver-plated

Common on jewellery and watches. The material only has a gold or silver-plated coating.

double

gold-plated

Common on jewellery and watches. The material only has a gold-plated coating.

american

gold-plated

Common on jewellery and watches. The material only has a gold-plated coating.

alpaca

Brass

Common on cutlery. The material is only made from the brass alloy alpaca.

Overview of silver alloys

StampsSilver ContentRemarks

800

80,0 %


830

83,0 %


835

83,5 %


900

90 %


925

92,5 %

Ster­ling­sil­ber

935

93,5 %


999

99,9 %

Fein­sil­ber

16 Lot

99,9 %

Fein­sil­ber

15 Lot

93,75 %


14 Lot

87,53 %


13 Lot

81,25 %


12 Lot

75 %


10 Lot

65,0 %


Overview of platinum alloys

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StempelPlatingehaltBemerkungen

950

95,0 %

Häu­figs­te Pt-​Schmuck­le­gie­rung

750

75,0 %


585

58,5 %