Argentium Silver

Argentium is a modern sterling silver alloy, patented in the early 2000s by British metallurgist Peter Johns. Like traditional sterling, it's mostly fine silver alloyed with a small amount of other metal for strength: pure silver on its own is too soft to hold its shape in a ring or clasp. The difference is what that other metal is: standard sterling uses copper alone, while Argentium replaces part of that copper with germanium.

That one substitution changes almost everything about how the alloy behaves, both on the bench while a piece is being made, and years later on someone's hand.

Standard sterling silver is 92.5% fine silver, 7.5% copper. That's the "925" stamp you've probably seen inside a ring band. Argentium raises the silver content slightly and replaces a portion of the copper with germanium, typically a percent or two of the total alloy:

Figures are approximate. Exact ratios vary slightly by supplier and grade (935 vs. the less common, higher-silver 960).

That small amount of germanium does a disproportionate amount of work. It forms a thin, stable oxide layer on the surface of the metal, which is responsible for most of what makes Argentium worth the extra cost and hassle to source:

• It resists firescale. Firescale is the dull gray-purple oxide discoloration that forms under the surface of standard sterling when it's heated with a torch, an unavoidable step in soldering and annealing handmade pieces. It's a constant fight for anyone hand-fabricating sterling jewelry. Germanium's oxide layer protects the metal during heating, so pieces come off the bench cleaner, with less polishing and buffing needed to fix it.
• It resists everyday tarnish. The same oxide layer that blocks firescale also slows the reaction with sulfur compounds in the air that turns standard sterling yellow, then brown, then black over time. Argentium pieces stay bright far longer between wears and cleanings.
• It runs brighter and whiter. Argentium has a noticeably whiter, more reflective finish than standard sterling, which tends to read slightly warmer/yellower, especially once it starts to tarnish.
• It can be hardened. Standard sterling stays relatively soft after it's formed. Argentium can be precipitation-hardened with a low, controlled heat treatment after shaping, which meaningfully increases its resistance to scratching, denting, and bending. That's useful for rings and bracelets that take daily wear.

None of the jewelry industry publishes a single agreed-upon numeric "durability score," so rather than invent one, here's how the two alloys generally compare on the properties that matter most day to day:

Illustrative comparison based on the metallurgical properties described above, not a third-party lab measurement.

Argentium needs less maintenance than standard sterling, not none. A few habits keep it looking its best:

• Wipe it down with a soft cloth after wearing, especially if it's touched lotion, perfume, or sweat.
• Store pieces in the anti-tarnish pouch or box they arrived in, away from humidity.
• Take it off before swimming, showering, or cleaning. Chlorine and harsh chemicals will dull any silver alloy, Argentium included.
• If it does dull slightly, a standard silver polishing cloth brings it back. You'll likely need it far less often than with a standard sterling piece.