Silver alloys

Argentium Silver

935‰, Argentium alloy

Bright silver-white, whiter and brighter than standard sterling; germanium oxide layer creates a harder surface

Composition

92.5–96% silver, germanium replacing part of the traditional copper content

Physical properties

Density 10.30 g/cm³ Weight per unit volume. Platinum is ~40% heavier than 18k gold at equal size
Melting range 900–950 °C Working temperature for alloys. Pure metals have a sharp melting point
Vickers hardness 100 HV Higher HV = greater scratch resistance in service
Mohs hardness 2.7 Approximate equivalent for comparative reference
Tensile strength 310 MPa Resistance to breaking under tension, relevant for prongs and fine settings
Purity 93.50% Fine metal content by mass
Tarnish resistance Very good Surface oxidation / sulphidation under typical wear conditions
Workability Excellent Ease of forming, soldering, and fabricating under standard jewellery workshop conditions
Hypoallergenic Hypoallergenic Likelihood of triggering skin reactions under normal wear

Common uses

Tarnish-resistant jewellery, contemporary silversmithing, settings, components where rhodium plating is to be avoided

Hallmarking & identification

Stamped 935 or 960 depending on variant. A proprietary alloy; the germanium content differentiates it from standard sterling.

Care & maintenance

Significantly more tarnish-resistant than standard sterling. Clean with warm soapy water. Can be firescale-free when annealed with appropriate techniques.

Market & pricing

Premium over standard sterling due to germanium content and proprietary licensing. Available from specialist suppliers.