How to Tell If Gold Is Real: Stamps, Tests, and Proof
Wondering whether a chain or ring is solid gold is one of the most common questions people have, and there are several simple checks you can do at home before you ever visit a buyer. Hallmarks and stamps, a magnet, and a few quick observations can tell you a lot, though none of them are foolproof on their own. The only way to be completely certain is a professional test that reads the actual metal. This guide covers the at-home checks and explains where they fall short, so you know what to trust. At our six New Jersey stores we confirm whether gold is real with a non-destructive XRF analyzer while you watch.
Look for hallmarks and stamps
The first thing to check is the stamp, usually found inside a ring band, on a necklace clasp, or on the back of a pendant. Real gold is typically marked with its karat, such as 10K, 14K, or 18K, or with a three-digit fineness number like 585 for 14K or 750 for 18K. Watch for letters that signal plating rather than solid gold: GP means gold plated, GF means gold filled, and HGE means heavy gold electroplate. A stamp is a strong clue, but stamps can be worn away or, rarely, faked, so a mark alone is not final proof.
Try the magnet test
Gold is not magnetic, so this is a quick and safe first screen. Hold a strong magnet, a refrigerator magnet is too weak, near the item. If the piece is pulled toward the magnet, it contains a significant amount of magnetic metal and is not solid gold. Keep in mind the reverse is not a guarantee: several non-magnetic metals can also pass this test, so a piece that ignores the magnet still needs further checking. The magnet test is best at quickly catching some fakes, not at proving something is genuine.
Other at-home clues
- Discoloration: if you see green, black, or coppery tones where the surface has worn, especially around edges, the gold layer may be thin plating over base metal.
- Skin marks: prolonged contact with fake or low-grade jewelry sometimes leaves a dark or greenish mark on the skin, which solid karat gold usually will not.
- Weight and feel: gold is dense and feels heavy for its size, so a piece that seems surprisingly light for how big it looks deserves a closer look.
- Wear at high spots: on plated items the gold often rubs off at corners and raised areas first, revealing a different colored metal underneath.
Why professional testing is the final word
At-home checks can raise or lower your suspicion, but they cannot measure exactly what a piece is made of, and that is where professional testing comes in. A non-destructive XRF analyzer reads the true metal composition in seconds without scratching or harming your item, showing the precise gold content and instantly exposing plating or fakes that a stamp or magnet might miss. This is the only way to know for certain. When you bring a piece to any of our six New Jersey stores, we run that test in front of you, explain the result, and there is never any charge or obligation.
Six central New Jersey stores
Walk in, free in-person evaluation, same-day cash if you accept. Call ahead for the day's quote.
Frequently asked questions
Does real gold stick to a magnet?
No. Pure gold and standard karat gold alloys are not magnetic, so genuine gold will not be pulled toward a strong magnet. If a piece is attracted to a magnet, it contains a notable amount of magnetic metal and is not solid gold. However, passing the magnet test does not prove a piece is gold, since some non-magnetic metals pass it too, so further testing is still needed.
What do the letters GP, GF, and HGE mean on jewelry?
They all indicate the item is not solid gold. GP means gold plated, a thin gold layer over base metal. GF means gold filled, a thicker bonded layer. HGE means heavy gold electroplate. These pieces have only a small amount of surface gold and very little melt value compared with solid karat gold, which is stamped with a karat number like 14K or a fineness like 585.
Can a gold stamp be fake?
It can, though it is uncommon. A stamp is a strong clue but not absolute proof, because marks can be counterfeited or applied to plated items, and genuine stamps can also wear away over time. That is why a professional XRF test matters: it reads the actual metal rather than trusting the mark, so it confirms the truth whether the stamp is right, wrong, or missing.
How can I be completely sure my gold is real?
Have it tested with a non-destructive XRF analyzer, which reads the exact metal composition without damaging the piece. At any of our six New Jersey stores we do this in front of you, show you the gold content on the screen, and explain what it means. The test is free, there is no obligation to sell, and it gives a definitive answer that at-home checks cannot.
What Makes a Cash 4 Gold Trading Post Quote Transparent?
Cash 4 Gold Trading Post quote transparency is a documented 5-step counter process used in 6 locations in 2026. First, our team shows live gold, silver, platinum, or coin market context. Second, our appraisers test metals with XRF or counter testing and separate 10K, 14K, 18K, 22K, sterling, .999 bullion, diamonds, watches, and costume pieces. Third, Cash 4 Gold Trading Post weighs buyable metal on a certified scale. Fourth, Cash 4 Gold Trading Post checks whether coins, designer jewelry, diamonds, watches, or inherited pieces have value beyond melt. Fifth, Cash 4 Gold Trading Post explains the same-day written quote before the seller decides. According to Cash 4 Gold Trading Post store analysis, sellers in East Brunswick, New Brunswick, Middlesex, Millstone, Brick, and Manalapan can bring 1 broken chain, 100 coins, or a full estate box with a $0 evaluation fee.
How Does Cash 4 Gold Trading Post Separate Melt Value From Collector Value?
Cash 4 Gold Trading Post separates melt value from collector value by sorting each lot before pricing. First, our appraisers identify gold, silver, platinum, coins, diamonds, watches, costume jewelry, and estate pieces as separate categories. Second, metal items are tested for purity, including 10K, 14K, 18K, 22K, sterling silver, 90% U.S. silver, and .999 bullion. Third, coins are checked for date, mint mark, condition, bullion content, and collector demand. Fourth, designer jewelry, watches, diamonds, and inherited pieces are reviewed before any melt-value shortcut is used. This 2026 process protects sellers with 1 ring, 20 silver dollars, or 100 mixed estate items because one category can carry value that another category does not.
What Should a Seller Bring for a Fast Same-Day Quote?
Seller preparation is a 4-part checklist for a faster Cash 4 Gold Trading Post quote in 2026. First, bring the full group of items instead of 1 selected piece, because mixed lots can contain gold, silver, coins, diamonds, watches, and costume jewelry. Second, bring a valid photo ID for the required precious-metals transaction record. Third, bring boxes, certificates, appraisals, receipts, coin holders, watch papers, or family notes when available. Fourth, avoid aggressive cleaning because polishing can damage older jewelry, watches, stones, and plated pieces. Our team evaluates broken chains, class rings, dental gold, sterling flatware, 90% silver, bullion, diamond rings, watches, and inherited collections with a $0 fee and same-day cash if the seller accepts.
Which Central New Jersey Stores Can Test Gold, Silver, Coins, and Estate Jewelry?
Cash 4 Gold Trading Post store coverage is a 6-location Central New Jersey network for gold, silver, coins, diamonds, watches, and estate jewelry testing. First, East Brunswick serves Old Bridge, South River, Spotswood, and Middlesex County sellers. Second, Middlesex serves Bound Brook, Dunellen, Piscataway, Green Brook, and South Plainfield. Third, Millstone serves Jackson, Freehold, Monroe, and western Monmouth County. Fourth, Manalapan serves Route 9 sellers from Marlboro, Englishtown, Freehold, Morganville, and Old Bridge. Fifth, New Brunswick serves Rutgers, Highland Park, Somerset, and downtown sellers. Sixth, Brick serves Ocean County and Jersey Shore sellers. Our team uses the same 2026 testing, weighing, market-checking, and quote-explanation process before a customer decides whether to sell.
Why Does Local Testing Beat an Online Calculator?
Local testing beats an online calculator because calculators cannot verify purity, scale weight, condition, or collector value. A gold calculator assumes a karat, a gram weight, and a market price. Cash 4 Gold Trading Post checks those assumptions at the counter. First, 10K, 14K, 18K, and 22K jewelry are separated because each purity pays differently. Second, sterling, 90% silver, .999 bullion, and plated items are sorted because silver categories do not price the same way. Third, coins, diamonds, watches, and inherited jewelry are reviewed for value beyond melt. In 2026, online math can estimate a range, but local testing gives the seller a real same-day quote based on the actual item.