How to Tell if Gold Is Real: 5 Tests You Can Do Right Now

August 28, 2026

The gold jewelry market has a counterfeiting problem that has existed for as long as gold jewelry has been sold. In 2026, with the rise of online marketplaces and international sellers, the number of gold-plated chains sold as solid gold is higher than at any point in recent memory. This guide gives you five tests you can perform before or after purchasing gold jewelry — some require tools you already have, none require laboratory equipment.

Test 1 — Look for the Hallmark (30 Seconds, No Tools)

Every piece of legitimate gold jewelry manufactured in the United States or imported from Italy, where most FJNYC pieces are made, carries a hallmark stamp indicating its purity. For chains, the stamp is on the clasp or within a centimeter of the clasp. For rings, it is on the interior of the band. For pendants, it is on the bail.

The hallmarks to look for: 10K or 417 (41.7% pure gold), 14K or 585 (58.3% pure gold), 18K or 750 (75% pure gold). If you see any of these stamps and they are crisp and clear, that is strong evidence of real gold. If there is no stamp, if the stamp is smeared or illegible, or if the seller cannot show you the stamp — treat the piece as suspect.

Test 2 — The Magnet Test (2 Minutes, Requires a Strong Magnet)

Gold is not magnetic. This property is consistent regardless of karat — 10K, 14K, and 18K gold are all non-magnetic. The most common base metals used in gold-plated jewelry — steel, stainless steel, and iron alloys — are magnetic.

How to perform: use a strong rare earth magnet (neodymium), not a standard refrigerator magnet. A refrigerator magnet is too weak to be conclusive. Hold the magnet close to or touching the chain. If the chain is attracted to the magnet with any force, it contains magnetic metal — it is not real gold throughout, and is almost certainly steel with a gold coating.

Important caveat: some gold-plated jewelry uses copper or brass as the base metal. Copper and brass are not magnetic — the magnet test will not detect them. The magnet test rules out magnetic base metals but does not confirm real gold against all counterfeits.

Test 3 — The Weight Test (5 Minutes, Requires a Precision Scale)

Gold is a dense metal. A solid 14K Cuban link chain at 5mm and 22 inches should weigh between 42 and 55 grams. If you weigh a chain claiming those specifications and it comes in at 12 grams, it is either hollow or not the dimensions it claims to be. The weight does not lie about the gold content.

Reference weights for solid 14K Cuban link chains: 3mm/22in = 18–24g, 5mm/22in = 42–55g, 7mm/22in = 75–100g. For hollow chains, expect 20 to 35 percent of these weights for the same stated dimensions. A chain significantly lighter than the solid reference weights for its stated dimensions is hollow, regardless of what the listing says.

Test 4 — The Nitric Acid Test (Advanced, Requires Acid Test Kit)

Gold test kits using nitric acid are available at jewelry supply stores and online for under $20. The test works by applying a small amount of acid to a barely visible scratch on the piece. Real 14K gold will show little to no reaction. Base metals and gold-plated pieces will react visibly — turning green (copper), bubbling (steel), or turning dark (various base metals). Each acid formula tests for a different karat.

This test is destructive in the sense that it requires a small scratch, but the scratch is minimal if done correctly. It is the most reliable home test for actual gold content. Jewelers use variations of this test routinely. At FJNYC, we perform this test on request for any piece brought to our showroom — whether purchased from us or elsewhere.

Test 5 — The Price Sanity Check (Instant, No Tools)

This is the test most people skip because the math feels like work, but it is the most powerful filter available before purchase. Gold has a commodity price that changes daily. A 5mm Cuban link chain in 14K solid gold at 22 inches weighs approximately 45–55 grams. At 2026 gold prices ($3,000/oz), the metal value of that chain is between $2,550 and $3,120. Add manufacturing and retail margin and the fair price is $3,200 to $4,500.

If someone offers you a 5mm, 22-inch, 14K solid Cuban link chain for $250, $500, or $800 — the price is impossible. The metal alone costs more than the asking price. The only explanations: it is hollow (weighs 8–12 grams, not 45), it is not 14K, or the dimensions are not what the seller states. There is no legitimate discount that explains a price that far below the metal value.

What to Do If You Suspect Fake Gold

If you already purchased a piece and suspect it is not what the seller claimed, bring it to a Diamond District jeweler for a professional acid test. At FJNYC, we test pieces for free — whether you bought it from us or elsewhere. If the piece fails the test, you have documentation for a dispute with the seller or credit card company.

Contact us at +1 (347) 202-4976 by WhatsApp or phone. English and Spanish. Showroom: 20 W 47th St, MZ 12, New York, NY 10036 — Monday through Friday, 12:00 PM to 5:00 PM.