Whether you’ve inherited a jewelry box, discovered old pieces in a drawer, or picked up items at an estate sale, figuring out whether gold jewelry is real — and how much it’s worth — is a question with real financial stakes. Gold-plated, gold-filled, and solid gold items can look nearly identical to the untrained eye, but their values are dramatically different. Here’s what you need to know to separate the genuine from the imitation — and what to do once you’ve figured it out.
Start with the Hallmark
The first and most reliable place to start is the hallmark — a small stamp or engraving found on most legitimate gold jewelry. In the United States, gold jewelry is typically stamped with a karat marking: 10K, 14K, 18K, or 24K. European pieces may instead show a millesimal fineness number: 417 (10K), 585 (14K), 750 (18K), or 999 (24K).
Look at clasps, inside ring bands, earring posts, and bracelet ends. Use a jeweler’s loupe or a magnifying glass — the stamps are often tiny. If you find a karat mark, that’s strong evidence the piece is solid gold, though it doesn’t rule out the possibility of a counterfeit or mismarked item.
Some stamps to be cautious about: “GF” (gold-filled), “GP” (gold-plated), “GE” (gold electroplated), and “HGE” (heavy gold electroplated). These indicate the piece has a surface layer of gold over a base metal core and are worth little to nothing for refining purposes.
The Magnet Test
Gold is not magnetic. If a piece is attracted to a strong magnet — a rare earth or neodymium magnet works best — it contains ferrous (iron-based) metal and is not solid gold. This test is quick and free.
One important caveat: passing the magnet test doesn’t confirm a piece is gold. Many base metals — copper, aluminum, brass — are also non-magnetic. So a negative magnet result is necessary but not sufficient proof of authenticity.
The Skin Discoloration Test
Real gold doesn’t react with skin. If you’ve ever worn a piece of jewelry that left a green or black mark on your skin, you can be fairly certain it’s not solid gold — or at best, it’s a very low-karat alloy with high base metal content. This is because base metals like copper oxidize and react with skin moisture and oils.
This test is not scientific, but it’s a useful anecdotal indicator when examining older pieces with an unknown history.
The Acid Test
Jewelers and gold buyers have used acid testing for generations. The process involves making a small scratch on a testing stone with the piece, applying nitric acid of different concentrations, and observing the reaction. Gold resists acid; base metals do not. A piece of known karat gold is used for comparison.
Acid test kits are available for purchase and are used by many gold buyers as a quick in-house test. However, they have limitations: they test only the surface layer (meaning gold-plated items can pass a surface test), and they require some experience to interpret accurately. They are best thought of as a screening tool, not a definitive assay.
XRF Analysis: The Gold Standard for Testing
X-ray fluorescence (XRF) analysis is the most accurate non-destructive method for determining gold purity. An XRF device emits X-rays that penetrate the surface of the metal and excite the atoms within, causing them to emit secondary X-rays. The pattern of those emissions reveals the exact elemental composition of the metal — gold percentage, silver content, copper, palladium, and more.
XRF testing takes only seconds and can read through surface plating to give a true compositional reading. Reputable gold buyers use XRF devices to give you an accurate valuation. If a buyer is offering to purchase your jewelry without any form of testing, that’s a red flag.
What About Gold-Plated and Gold-Filled Jewelry?
Gold-plated jewelry has a thin layer of gold — often just a few microns thick — bonded to a base metal core. It looks like gold but contains negligible precious metal content and is generally not worth refining. Gold-filled jewelry is different: it contains a substantially thicker layer of gold mechanically bonded to a base metal, and must be at least 5% gold by weight. Gold-filled items, particularly older pieces, can sometimes contain enough gold to be worth refining, especially in larger quantities.
Ready to Find Out What Your Jewelry Is Worth?
If you have gold jewelry — whether inherited, collected, or accumulated over years — and you’re curious about its value, Ark Refining offers transparent, tested, fair-market offers based on actual precious metal content. We use XRF analysis and fire assay to ensure accurate results and provide full documentation of every transaction.
Don’t leave money on the table by selling to a buyer who guesses at value or offers flat rates without testing. Contact Ark Refining today to learn what your gold is actually worth.