You want to know if your gold is real — or what karat it is. You have heard about acid tests, electronic testers, magnets, and XRF machines. You do not know which method is appropriate for your piece, your budget, and your question.
"Do you need to confirm metal content for a specific decision — selling, insuring, or just satisfying curiosity — or do you just need to rule out obvious fakes?"
Start with a magnet test at home. If the piece is non-magnetic, proceed to an electronic tester or acid test at a jeweler. Understand that these methods test the surface. For most day-to-day authenticity questions, surface testing is sufficient.
The magnet test is the only completely safe at-home test: gold is not magnetic. If a magnet sticks, the piece is not solid gold. But passing the magnet test does not confirm the piece is gold — brass and copper also do not attract magnets. For anything beyond ruling out iron, professional testing is required.
Yes. Acid testing involves applying nitric acid to the piece and observing the reaction. It leaves a small but permanent mark that may require polishing to remove — and polishing removes metal. Do not acid test a piece you wish to keep in its current condition. Let a professional do it, and only if necessary.
A jeweler can use multiple methods — visual inspection, magnet test, electronic tester, acid test, and XRF — to form a professional assessment. For most pieces, this combination provides high confidence. The only definitive confirmation that a piece is solid gold throughout requires cutting or drilling, which is destructive and rarely necessary outside of litigation or very high-value transactions.
Electronic testers are useful screening tools but are not definitive. They work best on clean, flat surfaces. They can be fooled by heavy gold plating, surface contamination, or irregular shapes. A positive result should be confirmed with another method. A negative result on a piece you believe to be gold should also be confirmed.
