Silver-Tone

Silver tone is the cool twin of gold tone: a brass or zinc alloy body finished with a thin layer of silver, rhodium or a silver colored coating. The absence of a 925 stamp is the reliable tell, since sterling is stamped by convention almost everywhere. Rhodium plated brass in particular looks identical to white gold at arm's length, which is exactly why it is used.

Plating rules do not change with the color. Thickness on fashion pieces is usually well under a micron. Wear appears first at clasps, edges and the inside of rings, and water, perfume and sweat all accelerate it. Rhodium is the hardest of the common top coats and lasts noticeably longer than plain silver plate. A listing that names rhodium is telling you something useful about lifespan.

Nickel is the real issue in this family. Hypoallergenic is not a regulated word in the US. It carries no promise about what is in the alloy or under the coating. Nickel silver, a common base metal, contains nickel and no silver at all. If your ears or wrists react, choose implant grade titanium, niobium, platinum, or solid gold with a stated nickel free alloy. Treat any unlabeled base metal as suspect.

Silver tone pieces are stamped or cast from brass, zinc alloy or nickel silver, then tumbled and polished. Most go through a copper strike first, a thin flash that helps later layers bond. In most production a nickel underlayer follows, and it keeps base metal from bleeding through.

The visible coat goes on last in an electroplating bath: fine silver for the warmest white, or rhodium for a harder, brighter and more expensive finish. Current, time and solution strength set the thickness, and on fashion jewelry that thickness is measured in fractions of a micron. Cheaper pieces skip plating altogether for a lacquered or vapor deposited coating, which looks right when new and fails faster. None of these processes leaves a mark on the piece, so there is no stamp to read and the listing is all you have.