What is the difference between 925 silver and silver-filled jewelry?

ZKZ Editorial TeamMain answer · Product & gemmology desk

925 silver, or sterling, is an alloy with at least 925 parts per thousand silver throughout. Plated or coated items have a layer of silver over another metal. "Silver-filled" is not a term we could find defined in the US rules we checked, so ask the seller exactly what it means.

What the US rules say

Fact The FTC Jewelry Guides (16 CFR 23.5) say that using "Sterling Silver", "Sterling", "solid silver" or "Ster." to describe an item may be misleading unless it is at least 925/1,000ths pure silver, and that using the word silver for an item with only a surface layer of silver may be misleading unless the term is adequately qualified to show it is only coated. This is a US guide.

Fact The same section says representing an item as plated or coated with silver may be misleading unless all significant surfaces have a plating or coating of silver of reasonable durability.

Fact The FTC guide for gold (16 CFR 23.3) does define "Gold Filled" and "Rolled Gold Plate" with requirements for mechanical application and durable thickness.

What we could not verify

Questions to ask a seller

• What is the base metal under the silver layer?
• Is the layer solid silver, plated or mechanically bonded?
• How thick is the layer and how was it measured?
• Is there a fineness mark, and what does it say?

Our advice A seller who cannot answer these is unlikely to be able to support a claim of quality, and a plain 925 stamp with a hallmark is simpler to trust.

Uncertain We found no definition of silver-filled in the sections we fetched, so we cannot say how it should be marked or how thick the layer must be. Treat claims as unverified until the seller states the layer composition, thickness and the base metal.

What to do

Our advice Ask for the fineness mark, the base metal and the plating or layer details in writing.

It depends Rules differ in the UK and EU, so the same wording may be treated differently there.

Related reading: What is the difference between melee and centre stones? · 925 Sterling Silver vs Sterling Silver: Is There a Difference?

Sources

• 16 CFR 23.5, FTC Jewelry Guides: misrepresentation as to silver content
• 16 CFR 23.3, FTC Jewelry Guides: misrepresentation as to gold content and plating

Fact = stated by the cited source. Our advice = editorial recommendation. Uncertain / it depends = limits of what can be said in general.