Because platinum commands a massive premium, it is a prime target for counterfeiters. A fake "platinum" ring is usually just a cheap silver or base-metal ring heavily plated in Rhodium to give it a bright white shine. How can you tell if you've been scammed?
1. The Hallmark Check
The absolute first step is looking for the stamp. Real platinum will be stamped with PT950, PT900, PLAT, or 950Pt. If a piece is stamped "925", it is Sterling Silver. If it has no stamp at all, be extremely suspicious. However, scammers can easily fake stamps, so further testing is required.
2. The Weight (Density) Test
This is the hardest test for counterfeiters to fake. Platinum is one of the densest elements on earth. It is 60% heavier than 18K gold and almost twice as heavy as silver.
If you have a platinum ring, drop it in the palm of your hand. It should feel surprisingly heavy for its size. If it feels light or "plasticky", it is likely silver. Jewelers use a water-displacement scale to calculate specific gravity; platinum's specific gravity is around 21.4 g/cm³.
3. The Magnet Test
Platinum is completely non-magnetic. Hold a strong neodymium magnet to the jewelry. If it sticks or even slightly pulls toward the magnet, it is absolutely fake (likely containing iron or nickel). Note: A lack of magnetism does not prove it is platinum, but magnetism proves it is a fake.
4. The Acid Test (For Professionals)
Jewelers use a chemical testing kit to verify platinum. They rub the ring against a slate stone to leave a streak of metal, then apply a specialized nitric/hydrochloric acid mixture.
- If the streak vanishes instantly, it is a base metal or silver.
- If the streak remains bright and untouched by the acid, it is pure platinum.
If you are buying second-hand platinum, always insist the jeweler runs an acid or XRF (X-ray) test in front of you before handing over the cash.