How to Tell If Jewelry Is Real Gold: 7 Tests You Can Do at Home

Fake gold looks identical to real gold — until you know what to look for. Whether you’ve inherited jewelry, bought a piece secondhand, or just want to verify what you own, these 7 tests give you increasing levels of certainty without needing specialist equipment for most of them.

Test 1: The hallmark test (always start here)

Real gold jewelry sold in most countries is required by law to be stamped with a karat mark indicating its purity. Look for these stamps on the clasp of a necklace or bracelet, inside a ring band, or on the back of earring posts.

What the stamps mean:

• 24K or 999 = 99.9% pure gold
• 18K or 750 = 75% pure gold
• 14K or 585 = 58.5% pure gold
• 10K or 417 = 41.7% pure gold (minimum legal standard in the US)
• 925 = sterling silver (not gold)
• GP, GF, or GEP = gold plated, gold filled, or gold electroplated (not solid gold)

No stamp doesn’t automatically mean fake — very old pieces and some foreign jewelry may lack stamps. But a piece claiming to be gold with a GP or GF stamp is not solid gold.

Test 2: The magnet test

Real gold is not magnetic. Hold a strong magnet (a neodymium magnet works best — available cheaply online) near your piece. If the jewelry is attracted to the magnet, it contains ferromagnetic metals like iron or nickel and is not solid gold.

Important limitation: This test rules out certain fakes but doesn’t confirm real gold, since some non-gold metals are also non-magnetic. Use it as a first filter, not a final answer.

Test 3: The skin test

Wear the piece for 30-60 minutes against your skin. Real gold doesn’t react with skin and leaves no discoloration. If you notice a green, black, or grey mark on your skin underneath the jewelry, the piece contains base metals reacting with your skin’s moisture and acids — it is not solid gold.

Note: Some people with sensitive skin react to even gold-filled pieces due to the base metal underneath the thin gold layer. The clearest sign is green discoloration, which indicates copper content.

Test 4: The nitric acid test

Nitric acid reacts differently with gold versus base metals and is one of the most reliable home tests. Small acid test kits are available online for under $20.

Scratch the piece lightly on a testing stone (included in kits) to leave a small deposit of metal. Apply a drop of nitric acid to the deposit. Real gold shows no reaction. Base metals turn green immediately. Gold-plated items may show a green reaction where the plating is thin and the base metal is exposed.

This test is highly reliable but involves acid — use gloves and work in a ventilated area.

Test 5: The float test

Drop the piece gently into a glass of water. Real gold is exceptionally dense — 14K gold is nearly 13 times denser than water — and sinks immediately and quickly. Fake gold pieces made from lighter metals may float or sink slowly.

Limitation: This test works best for solid pieces. Hollow gold jewelry may float or sink slowly even if genuine due to trapped air.

Test 6: The ceramic test

Drag the piece gently across an unglazed ceramic surface (the bottom of a ceramic plate or mug works well). Real gold leaves a gold streak. Fake gold or gold-plated pieces typically leave a black streak.

This is a quick and easy test but can leave a small scratch on the piece — test in an inconspicuous area.

Test 7: Professional jeweler assessment

If you’re still uncertain after home tests, a local jeweler can test your piece definitively using an electronic gold tester or professional acid test kit. Most jewelers will do a basic assessment at no charge or for a small fee. For valuable pieces, this is always worth doing before selling or insuring.

What to do with the results

If multiple tests suggest fake gold: the piece may still have value as costume or fashion jewelry, but don’t sell it as real gold or price it as such.

If tests suggest real gold: weigh the piece in grams, check the current gold spot price online, and calculate the approximate metal value using the karat purity. This gives you a minimum floor price when selling.