Fake gold and gold-plated items are a real risk in markets worldwide. Here are seven ways to check whether a piece is genuine gold - at home and at a jeweler.
Why This Matters
Gold fraud exists in every market - from street vendors to online platforms. Gold-plated brass, gold-filled alloys, and counterfeit hallmarks are common. Knowing how to verify authenticity protects your investment.
Method 1: Look for the Hallmark
The most reliable first step. Genuine gold in Russia, CIS countries, and most of the world carries an official stamp indicating purity:
- 585 - 14 karat (58.5% gold)
- 750 - 18 karat (75% gold)
- 999 - 24 karat pure gold (rare in jewelry)
- 375 - 9 karat (UK standard)
In Russia and Kyrgyzstan, the hallmark is applied by the State Assay Office and appears as a tiny eagle-head or kokoshnik stamp alongside the numbers. In the UAE, the Dubai Municipality stamp certifies gold sold in the souk.
A missing or unclear hallmark is a warning sign - though not conclusive.
Method 2: The Magnet Test
Gold is not magnetic. Hold a strong magnet (rare-earth/neodymium) near the piece.
- Attraction: The piece contains magnetic metals (iron, nickel). Not pure gold, though not necessarily worthless - some white gold alloys contain small amounts of nickel.
- No reaction: Does not prove gold, but eliminates base metal fakes.
This test rules out the most obvious fakes but won't catch gold-plated items.
Method 3: The Float Test
Gold is extremely dense (19.3 g/cm³ - heavier than lead). Drop the piece into a glass of water:
- Sinks immediately: Consistent with gold or other dense metals
- Floats or sinks slowly: Likely a lighter metal, possibly gold-plated aluminum or similar
A useful quick test, though gold-plated tungsten (another dense metal) would fool this.
Method 4: Skin Discoloration Test
Genuine gold does not oxidize and won't leave marks on skin. Apply some liquid foundation to your palm and rub the jewelry piece against it after it dries:
- Black mark left: Suggests real gold reacting with cosmetics in a specific way (counterintuitively, this can indicate higher purity)
- Green or black marks on your skin during wear: Base metals (copper, bronze) are reacting - not real gold
Method 5: The Nitric Acid Test
This is the professional standard. Nitric acid reacts with base metals but not with gold:
- Scratch the piece gently on a testing stone
- Apply a small drop of nitric acid to the scratch
- Reaction (green, fizzing): Base metal - not gold
- No reaction: Consistent with gold; further testing with different acid concentrations confirms karat level
This test requires a testing kit (available at jewelers' suppliers) and should be done carefully. It's accurate and is used by pawnshops, jewelers, and assay offices worldwide.
Method 6: X-Ray Fluorescence (XRF)
The modern standard for professional verification. An XRF analyzer emits X-rays that cause the metal's atoms to fluoresce, revealing the exact elemental composition.
- Completely non-destructive - no damage to the piece
- Exact percentage - tells you not just "gold" but the precise alloy composition
- Fast - results in seconds
Most reputable jewelers, pawnshops, and assay offices have XRF equipment. If you're buying a significant piece in an unfamiliar market, ask for XRF verification.
Method 7: Buy from Certified Sources
The most reliable protection: buy only from jewelers who provide:
- Official hallmark certificates
- State assay office documentation (in Russia/CIS: пробирная палата)
- Receipts with piece description and weight
At Diamond Gold Company, every piece carries an official 585 or 750 hallmark applied by the Kyrgyz State Assay Chamber. We ship with all documentation, including weight and hallmark certificates. View our catalog or contact us with questions.
Red Flags When Buying
Watch out for:
- Prices significantly below market rate for the weight
- Sellers who refuse to show the hallmark
- "Gold" that turns your skin green within days
- Online sellers without verifiable business identity
- Pieces marketed as "gold-filled" or "gold-tone" (these are not gold)
When in doubt, have the piece tested before purchase or, ideally, buy from a trusted manufacturer with documented certification.