How to Tell If Gold Is Real: 7 Tests That Actually Work

Why Gold Authentication Matters

Not all gold is what it appears to be. The market for fake and misrepresented gold items is significant, and selling a counterfeit piece unknowingly can cost you real money — or worse, land you in legal trouble. Understanding how to authenticate gold protects you whether you are buying, selling, or simply trying to figure out what you already own.

Gold fakes come in several forms. Gold-plated items have a microscopically thin layer of real gold over a base metal like brass or copper. They look identical to solid gold at first glance but contain almost no gold by weight. Gold-filled items have a thicker layer of gold bonded to a base metal, typically 5 percent gold by weight — better than plating but still far less valuable than solid gold. Tungsten-core fakes are the most sophisticated counterfeits: tungsten has nearly the same density as gold, making it extremely difficult to detect by weight alone. These are most commonly found in gold bars and coins rather than jewelry.

The good news is that most fakes can be caught with simple, inexpensive tests. By combining two or three of the methods below, you can determine with high confidence whether your gold is genuine before selling scrap gold or taking it to a buyer. Let's walk through each test, from the simplest to the most advanced.

7 Tests to Check If Gold Is Real

No single test is 100 percent foolproof. The best approach is to combine multiple methods — if your gold passes three or four of these tests, you can be highly confident it is genuine. Here are the seven most reliable ways to test gold, ranked from simplest to most advanced.

1. The Hallmark Test

The fastest way to check gold is to look for a hallmark stamp. Legitimate gold jewelry manufactured for sale in the United States and most other countries is required to carry a stamp indicating its purity. These stamps are typically tiny and may require a jeweler's loupe or magnifying glass to read clearly.

Where to look: On rings, check the inside of the band (the shank). On necklaces and bracelets, check near the clasp or on the tag end. On pendants, check the reverse side or on the bail (the loop that attaches to the chain). On earrings, check the post or the back of the earring.

What the stamps mean: Gold purity is expressed either in karats (K or KT) or in fineness (parts per thousand). Both systems are widely used. The table below shows the most common stamps and their meanings.

Caveats: A hallmark stamp is a good indicator but not a guarantee. Stamps can be faked, and vintage or handmade pieces may not carry stamps at all. A missing stamp does not necessarily mean the item is not gold — the stamp may have worn away, or the piece may predate modern hallmark requirements. Conversely, a stamp reading “14K” on a counterfeit piece is not unheard of. Use the hallmark test as a starting point, then confirm with additional methods.

2. The Magnet Test

Gold is a diamagnetic metal, meaning it is not attracted to magnets. This makes the magnet test one of the quickest ways to screen out obvious fakes. To perform the test, you need a strong neodymium magnet (also called a rare earth magnet), not a standard refrigerator magnet. Neodymium magnets are available online for a few dollars.

How to do it: Hold the neodymium magnet close to your gold item. If the item is pulled toward the magnet or sticks to it, it contains ferrous metal (iron, nickel, or steel) and is definitively not solid gold. Real gold will show no response to the magnet whatsoever.

Caveats: The magnet test is excellent at catching cheap fakes made with iron or steel cores, but it cannot catch all counterfeits. Copper, brass, aluminum, and tungsten are all non-magnetic, so a gold-plated copper ring or a tungsten-core gold bar will pass the magnet test despite not being solid gold. Think of this test as a quick “first filter” — if an item fails, it is definitely fake. If it passes, you still need additional tests to confirm authenticity.

3. The Density Test (Archimedes Method)

The density test is one of the most reliable home tests for gold because gold has a very specific density that is difficult to replicate with other metals (except tungsten). This method uses the principle discovered by Archimedes: an object submerged in water displaces a volume of water equal to its own volume, which allows you to calculate density.

Step-by-step instructions:

Step 1: Weigh the item on a digital gram scale. Record the weight in grams (for example, 15.2 grams).

Step 2: Fill a graduated cylinder or narrow container with water and note the water level. Alternatively, place a cup of water on your scale and tare (zero) it.

Step 3: Gently lower the item into the water on a string or thin wire. Note the new water level. The difference in water levels (in milliliters) equals the volume of the item in cubic centimeters. If using the scale method, the weight shown after submerging the item (in grams) equals the volume in cubic centimeters (since 1 mL of water weighs 1 gram).

Step 4: Divide the weight by the volume to get the density. For example: 15.2 grams ÷ 0.98 cm³ = 15.5 g/cm³.

Compare your result against the expected density for the claimed karat. If the density matches, your gold is very likely genuine.

Caveats: The density test is very accurate for solid items but can be thrown off by hollow pieces, items with gemstones, or pieces with internal air pockets. Also, tungsten has a density of 19.3 g/cm³ — nearly identical to pure 24K gold — which is why tungsten-core fakes exist. For items other than 24K bars or coins, however, tungsten's density is noticeably different from lower-karat gold alloys.

4. The Ceramic Scratch Test

The ceramic scratch test is a quick, low-cost method that uses an unglazed ceramic tile (sometimes called a “streak plate”). The unglazed back of a standard porcelain floor or wall tile works perfectly.

How to do it: Firmly press the gold item against the unglazed ceramic surface and drag it across, leaving a visible streak. Real gold will leave a gold-colored streak on the tile. Fake gold, gold-plated items, and pyrite (“fool's gold”) will leave a black, green, or dark-colored streak.

Caveats: This test will scratch your gold item, which is why it is typically used on scrap gold or items you do not mind marking. Do not use this test on fine jewelry or collectible coins where surface condition affects value. The test is also less reliable for gold-filled items, which have a thick enough gold layer to leave a gold-colored streak even though the item is not solid gold.

5. The Acid Test

The acid test is the traditional professional method for verifying gold purity and is used by pawnbrokers, jewelers, and gold dealers worldwide. Gold testing kits containing nitric acid solutions for different karat values are available online for $15 to $40.

How it works: Gold is chemically resistant to nitric acid. When you apply nitric acid to a gold surface (or to a streak left on a touchstone), genuine gold will not react. Base metals and gold alloys below the tested karat will dissolve or change color. For example, if you apply 14K testing acid to a piece claimed to be 14K gold: if it is truly 14K or higher, nothing happens. If it is 10K, the acid will cause the mark to turn brown. If it is fake (brass or copper), the acid will turn green and the mark will dissolve.

Safety warning: Gold testing acids are corrosive and can cause chemical burns. Always wear rubber gloves and safety glasses when handling them. Work in a well-ventilated area. Never let the acid contact skin, clothing, or surfaces you care about. Keep the acid bottles tightly sealed and away from children. If acid contacts skin, rinse immediately with cold water for at least 15 minutes.

Caveats: The acid test leaves a small mark on the item (though scratch marks on the test stone are typically used to avoid damaging the piece directly). Gold-filled items can sometimes resist acid long enough to give a misleading result if the test is performed superficially. For definitive results, the acid should be applied to a deep scratch that penetrates below any surface layer.

6. The Electronic Gold Tester

Electronic gold testers use electrical conductivity or electromagnetic properties to determine whether an item is gold and what karat it is. The most respected device in the industry is the Sigma Metalytics Precious Metal Verifier, which uses electromagnetic waves to measure resistivity at a specific depth below the surface — meaning it can detect plating and surface treatments that fool acid tests.

How they work: The device sends a small electromagnetic signal into the metal and measures the response. Different metals and alloys have unique conductivity profiles. The device compares the reading to known values for each karat of gold and displays the result. Most electronic testers can differentiate between 10K, 14K, 18K, 22K, and 24K gold, as well as identify silver, platinum, and palladium.

Cost: Professional electronic gold testers range from $250 for basic models to $1,500 or more for the Sigma Metalytics and similar professional-grade devices. While this is too expensive for most individual sellers, it is standard equipment at pawn shops, jewelry stores, and gold-buying businesses. If you are buying or selling gold regularly, the investment pays for itself quickly.

Caveats: Electronic testers are highly accurate but not infallible. Very thick gold plating (over 50 microns) can sometimes fool conductivity-based testers. The Sigma Metalytics mitigates this by reading at multiple depths, but no electronic test is as definitive as XRF (X-ray fluorescence) analysis for high-value items.

7. The Visual Inspection

A careful visual inspection can reveal telltale signs of fake or plated gold without any special equipment. While not as definitive as chemical or electronic testing, visual cues can help you identify items that deserve closer scrutiny.

Discoloration at wear points: Look closely at edges, clasps, hinge points, and any area that experiences friction during normal wear. If you see a different-colored metal showing through the gold surface — typically silver, gray, or green — the item is plated. Gold plating wears off over time, especially at high-contact areas, so well-worn pieces are easiest to assess.

Skin staining: Real gold does not typically stain skin. If wearing a gold ring or bracelet leaves green or black marks on your skin, the item likely contains significant amounts of copper or other base metals and is either gold-plated or a very low-quality alloy. (Note: in rare cases, certain cosmetics or pH levels can cause minor skin discoloration even with real gold, but persistent staining is a strong indicator of fake or heavily alloyed metal.)

Weight and feel: Gold is a very dense metal — 19.3 g/cm³ for pure gold. If you have handled real gold before, you will notice that solid gold items feel noticeably heavier than they look. Gold-plated items over base metals like brass or copper will feel lighter than solid gold of the same size. While this is a subjective test, it develops into a reliable instinct with experience.

Comparison: Which Test Should You Use?

Gold-Plated vs Gold-Filled vs Solid Gold

Understanding the difference between gold-plated, gold-filled, and solid gold is essential because each has dramatically different value. Many people discover their “gold” jewelry is actually gold-plated when they try to sell it and receive a much lower offer than expected.

Solid gold (stamped 10K, 14K, 18K, 22K, or 24K) is gold through and through — the entire piece is made from a gold alloy of the stated purity. Solid gold has the highest resale value and is what pawnbrokers and gold buyers are looking for. When you use our free gold value calculator, the estimates are based on solid gold.

Gold-filled (stamped GF, 1/20 14K GF, or 1/10 12K GF) has a thick layer of gold mechanically bonded to a base metal core, usually brass. The gold layer must constitute at least 5 percent of the total weight by US law. Gold-filled jewelry is more durable than gold-plated and has some scrap value, but it is worth far less than solid gold per gram. A 10-gram gold-filled bracelet might contain only 0.5 grams of actual gold.

Gold-plated (stamped GP, GEP, or HGE) has an extremely thin layer of gold applied to a base metal through electroplating. The gold layer is typically less than 0.5 microns thick and contains a negligible amount of gold by weight. Gold-plated items have essentially no scrap gold value. The stamps mean:

Common Gold Fakes and How to Spot Them

Understanding the types of gold counterfeits in circulation helps you know what to watch out for. Here are the most common fakes and the best way to detect each one.

Tungsten-Core Gold Bars and Coins

Tungsten is the gold counterfeiter's metal of choice for bars and coins because its density (19.25 g/cm³) is nearly identical to pure gold (19.3 g/cm³). A tungsten bar plated with real gold will pass the magnet test, the density test, and even surface acid tests. These counterfeits are primarily found in large gold bars (1 oz and above) purchased from unverified sources.

How to detect: The only reliable way to catch a tungsten-core fake is XRF (X-ray fluorescence) scanning, which analyzes the elemental composition of the metal at different depths. XRF machines can identify tungsten beneath a gold surface layer. Ultrasonic testing can also detect tungsten cores because the speed of sound through tungsten differs from gold. When buying gold bars worth thousands of dollars, always purchase from reputable dealers and request XRF verification.

Gold-Plated Copper or Brass Jewelry

This is the most common type of fake gold jewelry. A base metal item (usually copper or brass) is coated with a thin layer of real gold through electroplating. When new, these items can look identical to solid gold, but the plating wears off over time, especially at edges and clasps.

How to detect: Look for discoloration at high-wear areas. The density test will reveal these fakes easily — copper has a density of 8.96 g/cm³ and brass around 8.5 g/cm³, which is far lower than any karat of gold. The ceramic scratch test and acid test are also effective. Check for stamps: legitimate gold-plated items should be marked GP, GEP, or HGE, but counterfeiters sometimes stamp them with fake karat marks.

Gold-Filled Jewelry Sold as Solid Gold

Gold-filled jewelry is legitimate and has its own market, but it is sometimes misrepresented as solid gold. Because gold-filled items have a relatively thick gold layer, they can pass superficial acid tests and visual inspections.

How to detect: Check the stamp carefully — gold-filled items should be marked “GF” or with a fraction like “1/20 14K GF.” The density test is reliable here because gold-filled items have a noticeably lower density than solid gold of the same claimed karat. An electronic tester like the Sigma Metalytics can also detect the base metal core beneath the gold layer.

Fake Hallmark Stamps

Counterfeiters sometimes stamp fake karat marks onto non-gold items. These stamps may look slightly different from legitimate ones — the lettering may be uneven, too deep, too shallow, or in an unusual font. Legitimate hallmarks are typically clean, uniform, and precisely applied.

How to detect: If you suspect a fake stamp, use a jeweler's loupe (10x magnification) to examine it closely. Compare it against known genuine stamps. More importantly, always confirm with a secondary test (magnet, density, or acid) rather than relying on stamps alone.

When to Get Professional Testing

Home tests are useful for a preliminary assessment, but professional testing is recommended whenever significant money is at stake. If you are planning to sell gold items worth more than a few hundred dollars, the cost of professional verification is a small price to pay for certainty.

Pawn shops test for free. Most pawn shops and gold-buying businesses will test your gold at no charge as part of the buying process. They have electronic testers and acid testing kits on hand because they need to verify every item before making an offer. This is one of the advantages of selling to a pawnbroker — you get free, professional authentication even if you decide not to accept their offer.

Jewelers charge a small fee. Independent jewelers may charge $10 to $30 for a basic acid test or hallmark verification. This is worthwhile if you want an independent assessment before shopping your gold around to buyers.

XRF analysis for high-value items. For gold bars, large coin collections, or any item worth several thousand dollars or more, XRF (X-ray fluorescence) testing is the gold standard (pun intended). XRF is non-destructive, highly accurate, and can detect tungsten cores and other sophisticated counterfeits that defeat all other tests. XRF testing typically costs $25 to $75 per item at a jeweler or assay office.

Assay offices. For the highest level of verification, assay offices provide formal, certified testing results. This is typically only necessary for very high-value transactions, estate settlements, or insurance purposes. Assay testing is more expensive ($50 to $200 per item) and takes several days, but the certification is legally recognized.

Get an Instant Gold Value Estimate

Once you have confirmed your gold is real and identified its karat purity, the next step is finding out what it is worth. Use our free gold value calculator to get an instant melt value estimate based on today's live spot price. Simply enter the weight in grams and select the karat, and the calculator will show you the current market value along with estimated pawn and resale ranges.

If you are ready to sell, read our complete guide on selling scrap gold to learn where to get the best price, how to negotiate, and how to avoid common scams. For a deeper dive into at-home testing methods, see our detailed guide to testing gold at home.

Frequently Asked Questions

How can I test gold at home without acid?

You have several acid-free options. The magnet test is the easiest — hold a strong neodymium magnet near the item and see if it is attracted (real gold is not magnetic). The density test is the most accurate home method: weigh the item in grams, submerge it in water to measure volume, and calculate density. Compare the result against expected values for the claimed karat (for example, 14K gold should have a density of approximately 12.9 to 14.6 g/cm³). The hallmark test (checking for karat stamps) and the ceramic scratch test (rubbing on unglazed porcelain) are also effective without requiring acid. For the best results, combine two or three of these methods.

Does real gold stick to a magnet?

No. Real gold is diamagnetic and shows no attraction to magnets. If your item sticks to a strong neodymium magnet, it contains ferrous metals (iron, nickel, or steel) and is not solid gold. However, passing the magnet test does not guarantee an item is gold — many non-gold metals like copper, brass, and tungsten are also non-magnetic. Use the magnet test as a quick screening tool to rule out cheap fakes, then confirm with the density test, acid test, or professional electronic testing.

How can I tell if my gold jewelry is real or plated?

Start by checking the stamp. Solid gold is marked with karat values (10K, 14K, 18K, 24K) or fineness numbers (417, 585, 750, 999). Gold-plated items carry stamps like GP, GEP, HGE, or RGP. Gold-filled items are marked GF. Beyond stamps, inspect high-wear areas (clasps, edges, inside of rings) for discoloration — if a different-colored metal is showing through, the piece is plated. The density test is also very effective: solid gold is significantly denser than gold-plated base metals. Real gold typically does not leave green or black marks on your skin, while plated items frequently do.

How much does professional gold testing cost?

Professional gold testing costs vary by method and provider. Most pawn shops and gold buyers test for free as part of their buying process. Independent jewelers typically charge $10 to $30 for a basic acid test or hallmark verification. XRF (X-ray fluorescence) analysis, which is the most accurate non-destructive method, usually costs $25 to $75 per item at a jeweler or assay office. Formal assay certification costs $50 to $200 per item but is generally only needed for very high-value transactions or legal purposes.