How to Tell If Gold Is Real: Tests That Actually Work – Mapple Gems

Part of our buying-with-confidence series — see The Stamps Inside Your Ring, Decoded.

Education · Metals

How to Tell If Gold Is Real: What Works, and What's Just a Myth

Bite tests, vinegar and magnets are all over the internet. Some tell you something; most don't. Here's what actually confirms solid gold.

Written by the Mapple Gems workshop, Surat · Updated 25 September 2026

Short answer

Start with the stamp: marks like 417 (10K), 585 (14K) or 750 (18K) indicate the karat, though stamps can be faked. A magnet test is a quick screen — gold isn't magnetic. For certainty, a jeweller's acid test or, best of all, an XRF analyser gives a real answer without damaging the piece. Bite, vinegar and float tests are unreliable.

Whether you've inherited a piece, found one in a drawer or want to check a purchase, the question is the same: is this solid gold, gold-plated, or something else? The honest answer is that home tests can raise a flag, but only proper testing confirms it.

Gold tests compared

Test	What it tells you	Reliable?
Stamp / hallmark	Claimed karat	A good start; can be faked
Magnet	Strong attraction suggests a non-gold core	Screening only; clasps may contain steel
Acid test (jeweller)	Approximate karat	Good, but marks a tiny area
XRF analyser	Surface composition	Best non-destructive option
Bite / vinegar / float	Very little	Unreliable — skip them

From the bench in Surat

The trap with home testing is plated jewelry. A gold-plated or gold-filled piece has real gold on the surface, so any test that only touches the surface — including a quick acid scratch done lightly, or even XRF, which reads mainly the outer layer — can say "gold". That's why jewellers file a tiny notch in a hidden spot before an acid test on anything doubtful. Where plating is worn, look at high-wear points like the back of a clasp or the base of a ring: a different colour showing through is the clearest home clue of all. In India, hallmarked gold carries the BIS mark and a unique HUID code, which is another useful check on Indian-made pieces.

Reading the stamp

Common numbers: 375 or 9K, 417 or 10K, 585 or 14K, 750 or 18K, 916 or 22K. Letters like GP, GF, HGE or RGP mean plated or gold-filled, not solid gold. For more, see the stamps inside your ring, decoded. If you're checking plated pieces specifically, what rhodium plating is explains the finish on white gold.