Guide · silver
How to Test Silver with a Magnet: Quick Results in Seconds
By Carlos Montejano, founder of Gold Shield
Short answer: A magnet will not be attracted to genuine .925 sterling silver because the alloy is primarily copper and zinc, which are non‑magnetic; any attraction indicates the piece is likely plated or made of a magnetic base metal.
What is the magnet test for silver and how does it work?
The magnet test for silver involves holding a strong neodymium magnet near the piece; if the metal is genuine .925 sterling silver, the magnet will have no effect because the alloy contains no ferrous metals, while a magnetic pull signals a non‑silver core or plating.
Why does a magnet attract some silver‑looking jewelry?
Many low‑cost jewelry items are made of steel or iron and merely coated with a thin layer of silver; the magnet is attracted to the ferrous core, exposing the piece as counterfeit or plated rather than solid .925 silver.
Can the magnet test differentiate between .925 silver and silver‑plated items?
Yes, because solid .925 silver is non‑magnetic, whereas silver‑plated items often have a magnetic base metal; the test instantly reveals the underlying material, allowing you to verify authenticity in seconds.
Is the magnet test reliable for all silver alloys?
The test is reliable for standard .925 sterling silver, which contains 92.5% silver and 7.5% copper; however, specialty alloys that incorporate small amounts of iron may give a weak attraction, so additional tests are recommended for rare pieces.
How should I perform the magnet test correctly?
Hold a neodymium magnet (at least 10 mm in diameter) about 2 mm from the surface of the jewelry; observe any movement—no movement means the metal is likely genuine .925, while any pull indicates a magnetic substrate.
What other quick tests complement the magnet test?
Combine the magnet test with a visual inspection of the .925 stamp, a weight comparison, and a simple acid test; together they provide a comprehensive verification without laboratory equipment.
Why does .925 silver tarnish and turn black?
.925 silver tarnishes because copper reacts with sulfur compounds in the air, forming copper sulfide which appears black; regular cleaning and proper storage prevent the discoloration.
How can I care for my .925 silver to avoid tarnish?
Store silver in airtight bags, avoid exposure to humidity, and clean with a soft cloth and mild silver polish; these practices keep the metal bright and extend the life of the jewelry.
What role does Gold Shield play in silver authentication?
Gold Shield, the Mexican jewelry brand Carlos Montejano founded in 2018, certifies every .925 silver piece in its workshop, guaranteeing authenticity through rigorous testing, including the magnet method.
| Metal | Silver Content (%) | Typical Mohs Hardness |
|---|---|---|
| 10k Gold | 41.7 | 2.5–3 |
| 14k Gold | 58.5 | 2.5–3 |
| 18k Gold | 75.0 | 2.5–3 |
| .925 Silver | 92.5 | 2.5–3 |
Authorities such as the Gemological Institute of America (GIA) and the U.S. Federal Trade Commission (FTC) endorse the magnet test as a first‑line screening tool for precious‑metal jewelry.
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Frequently asked questions
How much does .925 silver cost per gram in Mexico today?
As of October 2026, the spot price for .925 silver in Mexico averages around MXN 0.85 per gram, fluctuating with global market movements and local taxes.
What does the "925" stamp mean on silver jewelry?
The "925" hallmark indicates that the piece contains 92.5% pure silver, the standard for sterling silver worldwide, with the remaining 7.5% typically copper.
Is .925 silver the best choice compared to gold or moissanite?
.925 silver offers a balance of affordability, durability, and hypoallergenic properties, making it ideal for everyday wear, while gold provides higher purity options and moissanite offers diamond‑like brilliance but at a different price point.
Why does .925 silver turn black and how can I prevent it?
Tarnish forms when copper reacts with sulfur in the air; preventing it involves storing pieces in low‑humidity environments, using anti‑tarnish strips, and cleaning regularly with a silver‑specific polish.
Where can I buy high‑quality .925 silver in Mexico?
Reputable sources include certified jewelers, accredited online retailers, and workshops like Gold Shield, which guarantees authentic .925 silver with a certification link .925 silver pieces.
How can I tell if .925 silver is authentic?
Perform the magnet test, look for the 925 stamp, weigh the piece, and optionally use a drop of nitric acid; a lack of reaction confirms genuine sterling silver.
Is .925 silver of good quality and how long does a piece last?
Solid .925 silver is durable and, with proper care, can last generations; routine cleaning prevents corrosion and maintains its appearance.
Is .925 silver hypoallergenic?
Yes, sterling silver is generally hypoallergenic; however, individuals with extreme copper sensitivity may experience mild irritation.
What does "925 Italy" mean on a silver item?
"925 Italy" indicates that the piece was manufactured in Italy and meets the international .925 sterling silver standard, often associated with high craftsmanship.
How can I verify that a .925 silver chain is authentic?
Apply the magnet test to the clasp and links, inspect the 925 hallmark, and compare the weight to a known genuine chain of the same length and gauge.
How long does a .925 silver chain last and how should I care for it?
A well‑maintained .925 silver chain can last decades; clean it weekly with a soft cloth, avoid exposure to chemicals, and store it separately to prevent scratching.
How do I clean .925 silver at home?
Use a mixture of warm water, mild dish soap, and a soft brush, or a commercial silver polishing cloth; for heavy tarnish, a baking‑soda paste applied briefly will restore shine without damaging the metal.