Silver marked “925” or “Sterling” contains at least 92.5% silver; “coin silver” means at least 90% — but the mark alone never proves the whole piece is solid silver.
The hardest lesson in identifying antique silverware: a stamp is evidence, not a verdict — and a clean, shiny surface proves almost nothing.
What Marks Actually Mean
In the U.S., “sterling” means at least 925 parts per 1,000 silver, and “coin silver” at least 900 parts per 1,000, per the Federal Trade Commission. The FTC also requires silver items with a quality designation to show the name or U.S.-registered trademark of the company behind that claim. Look for two marks: the fineness stamp plus a maker’s identity.
- Sterling, sterling silver, Ster., 925,.925 — at least 92.5% silver.
- Coin, coin silver — at least 90% silver.
- Silver plate, silver-plated, electroplate, EPNS, A1, quadruple plate — base metal core with a silver surface layer.
- German silver, nickel silver, alpaca — copper-nickel-zinc alloys with no silver at all.
A missing British-style hallmark doesn’t mean counterfeit. The U.S. never ran a comprehensive hallmarking system, so American silver often carries only a maker’s mark and fineness stamp. Record each mark exactly — punctuation, shield outlines, letters, symbols — then compare against museum databases, auction records, or manufacturer archives. Counterfeit stamps exist, so a famous name isn’t a guarantee.
How To Test At Home
Most home tests can rule silver out, but only professional testing can rule it in.
- Magnet test. Silver is nonmagnetic. A strong pull means iron or steel. A weak or absent pull means nothing — many base metals are also nonmagnetic.
- Wear inspection. On edges, raised decoration, and knife handles, exposed yellow, gray, or copper-colored base metal means plating loss.
- Tarnish and appearance. Silver commonly tarnishes gray or black, but lacquer, cleaning, storage, and alloy mix change appearance. Brightness is not a test.
- Sound, ice, and heft. Mixed, hollow, weighted, or repaired pieces defeat these. Never rely on them alone.
- Acid testing. Can permanently mark an antique and give false readings on plating or solder. Skip it on anything valuable.
| Method | What It Reveals | Reliability |
|---|---|---|
| Reading fineness marks | Claimed silver content of that component | Strong evidence, not proof |
| Maker’s mark lookup | Likely manufacturer and era | Good, and counterfeit marks exist |
| Magnet test | Magnetic base metal such as iron or steel | Rules out only, never rules in |
| Wear inspection | Plating loss on high-contact areas | Reliable for spotting plate |
| Acid testing | Surface silver content | Damages value, easily misled |
| XRF scan by a pro | Elemental makeup of the surface layer | Fast, usually non-destructive |
| Fire assay | Full metal composition | Definitive but destroys the piece |
For anything valuable or museum-quality, the FTC’s consumer guidance points toward professional evaluation before you test or sell. A precious-metals dealer or appraiser familiar with buying platinum, gold, and silver jewelry can arrange an X-ray fluorescence scan, which is quick and usually non-destructive.
Why “925” Doesn’t Mean The Whole Piece Is Solid
A sterling mark applies to the marked component only — a knife blade can be a different metal while the handle is genuine sterling. Weighted or hollow handles often contain pitch, resin, or cement. Testing one ornament or blade and applying that reading to an entire boxed set is a common, expensive mistake; pieces in the same chest can come from different makers and metals.
If you’re weighing whether to restore or replace a set, browsing tested antique silverware sets worth buying shows current patterns and what complete services sell for.
Before cleaning, photograph marks and keep receipts, estate records, and old appraisals. Skip bleach, chlorine, abrasive dips, wire brushes, and harsh compounds — they strip patina, engraving, and manufacturing evidence. Wear gloves on valuable pieces, and use ventilation and eye protection for any chemical test.
Common Questions
Does a 925 stamp guarantee solid sterling?
No. The stamp covers the marked component only. A knife blade or weighted handle can contain filler or a different metal while the visible stamp reads 925 or sterling.
Can a magnet tell me if silver is real?
Only in one direction. A strong attraction points to iron or steel and rules silver out; plenty of base metals and plated pieces are nonmagnetic too, so a quiet magnet tells you nothing useful.
Is it worth acid testing old silverware?
Rarely. Acid can leave permanent marks, hurt resale value, and give misleading readings on plating or solder. A professional XRF scan is faster and generally non-destructive.
Sources
- Federal Trade Commission. “Buying Platinum, Gold, and Silver Jewelry” Explains fineness standards, required maker marks, and professional evaluation.
- Federal Trade Commission. “Summary of Basis and Purpose for the Revised Jewelry Guides” Sets the 925/1,000 sterling and 900/1,000 coin silver thresholds.
- Federal Trade Commission. “Guides for the Jewelry, Precious Metals, and Pewter Industries” Covers coated and plated product labeling rules.