3 Ways To Test Gold At Home - WikiHow

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Terms of Use wikiHow is where trusted research and expert knowledge come together. Learn why people trust wikiHow How to Test Gold at Home PDF download Download Article Test an item of gold for authenticity using everyday tools Co-authored by Kennon Young

Last Updated: July 7, 2025 Fact Checked

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  • Inspecting the Surface
    • |
  • Conducting Deeper Testing
    • |
  • Performing Acid Testing
    • |
  • Video
    • |
  • Expert Q&A
    • |
  • Tips
    • |
  • Warnings
|Show more |Show less X

This article was co-authored by Kennon Young. Kennon Young is a Master Gemologist Appraiser and the Owner of Vermont Gemological Laboratory in Burlington, Vermont. With over 20 years of experience in the industry, Kennon and his team specialize in handmade engagement rings, wedding bands, and custom jewelry. He attended the Revere Academy of Jewelry Arts, the Gemological Institute of America, and the Rhode Island School of Design Extension. He is a Jewelers of America (JA) Certified Bench Jeweler Technician and received the highest credential in the jewelry appraisal industry, the ASA Master Gemologist Appraiser, in 2016. There are 8 references cited in this article, which can be found at the bottom of the page. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 914,459 times.

Gold is a precious metal that comes in a variety of colors and different levels of fineness. The value of a piece of jewelry or another object will depend greatly on whether or not it is plated or pure gold. To identify the quality of a metal object, start by taking a close look at its surface. If you're still unsure, move on to more in-depth testing, such as a vinegar application. As a final option, consider applying acid to the metal item and watching for a reaction.

How do you test gold purity at home?

Inspect the gold closely for a stamp (or "hallmark") that indicates its purity, or lack thereof. A gold-plated item may have "GF" or "HGP" stamped on it, while pure gold pieces may have "24K" stamped on them. You can also hold the gold item up to a magnet—if it seems drawn to the magnet, it isn't pure gold.

Steps

Method 1 Method 1 of 3:

Inspecting the Surface

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  1. Step 1 Look for a hallmark. 1 Look for a hallmark. A piece of gold will usually be stamped with a mark indicating its type. A stamp of “GF” or “HGP” indicates that the piece is gold-plated, not pure gold. In contrast, a pure gold piece of jewelry may show a “24K” or other marking indicating fineness. Hallmarks are usually located inside the band of rings or near the clasp on necklaces.
    • However, be aware that some hallmarks can be faked. This is why it’s important to use a mark as only one of many indicators of authenticity.
    • The hallmark may be very small. You might even need a magnifying glass in order to see it clearly.
  2. Step 2 Look for fading around the edges of the piece. 2 Look for fading around the edges of the piece. Turn on a bright light or lamp. Hold the piece close to the lamp’s light. Rotate it in your hand, so that you can examine all of the edges in particular. If you see that the gold appears faded or worn away at the edges, then it’s likely wear on the plating. This means that piece isn’t pure gold.[1] Advertisement
  3. Step 3 Look for spotting on the piece’s surface. 3 Look for spotting on the piece’s surface. If you hold the piece under a bright light, do you notice white or red spots anywhere on it? The spots may be very tiny and difficult to see. That is why it’s important to examine the piece under a bright light and maybe with a magnifying glass. These spots indicate that the gold plating may be wearing away showing the metal underneath.[2]
  4. Step 4 Place a magnet against the potential gold item. 4 Place a magnet against the potential gold item. Hold a magnet directly above the piece. Lower the magnet until it is almost touches the surface of the item. If you feel as if the magnet is being drawn or pulled downward, then the item is not pure. The other metals in the item, such as nickel, are responding to the magnet. A pure gold piece will not draw the magnet, since non-ferrous.
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Method 2 Method 2 of 3:

Conducting Deeper Testing

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  1. Step 1 Apply some vinegar... 1 Apply some vinegar to the surface and look for a color change. Get a dropper and fill it up with white vinegar. Hold your metal object firmly in your hand or set it on a table. Place a few drops of vinegar onto the object. If the drops change the color of the metal, then it is not pure gold. If the color stays the same, then it is pure gold.[3]
  2. Step 2 Rub your gold against a jeweler’s stone. 2 Rub your gold against a jeweler’s stone. Position a black jeweler’s stone on a table. Hold your gold piece firmly in your hand. Wipe it across the stone firmly enough to leave a mark. If the mark that you’ve left on the stone is solid and gold in color, then the piece is pure. If there is no line or only a faint one, then the piece is likely plated or not gold at all.[4]
    • Be careful with this method as you run the risk of damaging your jewelry. You also have to use the right type of stone or the marks will be meaningless. You can get a jeweler’s stone through a jewelry supply store online or by talking with your local jeweler.
  3. Step 3 Rub your gold across a ceramic plate. 3 Rub your gold across a ceramic plate. Set an unglazed ceramic plate firmly on a countertop or table. Hold your gold item in your hand. Scrape the item against the plate. Watch to see if a streak or line of any type appears. A black line indicates that the item is not gold or is plated.[5]
  4. Step 4 Test your gold against liquid foundation makeup. 4 Test your gold against liquid foundation makeup. Coat the top of your hand with a thin layer of liquid foundation. Wait until the foundation is dry. Press your metal item against the foundation and rub. Authentic pure gold will leave a line in the makeup. If you do not see a line, then the object is plated or another metal.[6]
  5. Step 5 Use an electronic gold tester. 5 Use an electronic gold tester. This is a small hand-held device with a probe at the end that you can buy online or through a jewelry supply store. To analyze a metal, you rub a conductive “tester” gel on to the metal item. This gel is usually available for purchase from the same places that sell testing devices. After you’ve applied the gel, rub the probe against the item. How the metal responds to the electricity will indicate whether or not it is pure metal.[7]
    • Use the instructions that come with your tester to determine the exact results. Gold is a conductive metal, so a pure gold piece will have higher readings than a plated one.
  6. Step 6 Insert your gold into an XRF machine. 6 Insert your gold into an XRF machine. This is a machine that many jewelers use to instantly determine the quality of a metal sample. Because of its cost this method may not be suitable for home use, unless you plan on using it regularly. To use an XRF scanner, place the piece of metal inside, activate the machine, and wait for the read out.
  7. Step 7 Take your gold to an assayer. 7 Take your gold to an assayer. If you keep getting mixed results or if you’d like to verify your finding, talk to your jeweler about getting another professional opinion.[8] An assayer will perform a deep analysis of the content of the metal. This can be a costly option, so only use it if you believe your item may be worthwhile.[9]
    8. Advertisement
Method 3 Method 3 of 3:

Performing Acid Testing

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  1. Step 1 Buy an acid testing kit for a more precise estimate of gold karat purity. 1 Buy an acid testing kit for a more precise estimate of gold karat purity. You can purchase one of these kits through a jewelry tool supplier. The kit will contain all of the materials that you’ll need along with a set of detailed instructions. Make sure to read the instructions carefully before beginning and conduct an inventory of the supplies before starting.[10]
    • These kits can be quite affordable, if ordered online. They start at around $30.
  2. Step 2 Inspect the needles for karat value labels. 2 Inspect the needles for karat value labels. Your kit will contain a number of needles that you’ll use for testing different types of gold. Look for a karat value marking on the side of the needle. Each needle will also have a colored gold sample at the tip. Use the yellow needle for yellow gold and the white needle for white gold.[11]
  3. Step 3 Make a notch with an engraving tool. 3 Make a notch with an engraving tool. Turn the piece around until you find a less noticeable spot. Hold an engraving tool firmly in your hand and make a small divot in the metal. The goal is to expose the deeper layers of the metal.[12]
  4. Step 4 Put on protective gloves and goggles. 4 Put on protective gloves and goggles. Since you are working with acid, it’s important to don thick, but fitted, gloves. Eye protection is also a good idea, just to be extra cautious. Avoid touching your face or your eyes while working with the acid.[13]
  5. Step 5 Place a drop of acid on the notch. 5 Place a drop of acid on the notch. Select the proper needle for the gold type. Then, hold the needle tip directly over the notch. Push the plunger of the needle down until a single drop of acid drops into the divot.[14]
  6. Step 6 Read the results. 6 Read the results. Look closely at the divot that you made earlier and where you just applied the acid. The acid will react with the metal and may turn a particular color. Generally, if the acid turns a green color, this indicates that the piece is not pure metal, but instead gold plated or another metal entirely. Since testing kits have different color indications, make sure to read the color guide carefully as you interpret the test results.[15]
    • You can also do the nitric acid test. Nitric acid can help determine the presence of base metals in gold items. Apply a small amount of nitric acid to a discreet part of the item. Observe any color changes; if the acid causes the metal to turn green, it may indicate a lower gold content.
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Expert Q&A

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  • Question How can you tell if something is gold without hallmark? Kennon Young Kennon Young Master Gemologist Appraiser Kennon Young is a Master Gemologist Appraiser and the Owner of Vermont Gemological Laboratory in Burlington, Vermont. With over 20 years of experience in the industry, Kennon and his team specialize in handmade engagement rings, wedding bands, and custom jewelry. He attended the Revere Academy of Jewelry Arts, the Gemological Institute of America, and the Rhode Island School of Design Extension. He is a Jewelers of America (JA) Certified Bench Jeweler Technician and received the highest credential in the jewelry appraisal industry, the ASA Master Gemologist Appraiser, in 2016. Kennon Young Kennon Young Master Gemologist Appraiser Expert Answer It would be needed to test it in a scientific way - by acid testing, or electronic testing, or laser testing. Typically you'll want to find a jewelry appraiser to do that for you. It costs money, but it is highly recommended if you are going to sell jewelry. It would be a poor financial decision to make assumptions on your own. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 30 Helpful 46
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Video

Tips

  • Make sure to fully wipe down the gold between testing methods. Thanks Helpful 9 Not Helpful 7
Submit a Tip All tip submissions are carefully reviewed before being published Name Please provide your name and last initial Submit Thanks for submitting a tip for review! Advertisement

Warnings

  • Use extreme caution when working with acid, as it can severely damage your skin upon contact. Thanks Helpful 19 Not Helpful 14
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References

  1. ↑ http://www.financialexpress.com/industry/banking-finance/buying-or-selling-gold-5-ways-to-check-yellow-metals-purity/380365/
  2. ↑ http://www.financialexpress.com/industry/banking-finance/buying-or-selling-gold-5-ways-to-check-yellow-metals-purity/380365/
  3. ↑ https://ourpastimes.com/test-gold-vinegar-5854786.html
  4. ↑ http://www.financialexpress.com/industry/banking-finance/buying-or-selling-gold-5-ways-to-check-yellow-metals-purity/380365/
  5. ↑ https://youtu.be/pzaKMePtwik?t=69
  6. ↑ https://www.youtube.com/watch?v=WLhZT0nTXTc
  7. ↑ https://www.livescience.com/29188-how-to-check-gold.html
  8. ↑ Kennon Young. Certified Jeweler. Expert Interview
  9. ↑ https://sciencing.com/test-rock-gold-4471786.html
More References (6)
  1. ↑ https://www.gia.edu/bench-tip-use-the-touchstone-method-for-testing-purity-karat-gold
  2. ↑ https://www.gia.edu/bench-tip-use-the-touchstone-method-for-testing-purity-karat-gold
  3. ↑ https://www.gia.edu/bench-tip-use-the-touchstone-method-for-testing-purity-karat-gold
  4. ↑ https://www.gia.edu/bench-tip-use-the-touchstone-method-for-testing-purity-karat-gold
  5. ↑ https://www.gia.edu/bench-tip-use-the-touchstone-method-for-testing-purity-karat-gold
  6. ↑ https://www.gia.edu/bench-tip-use-the-touchstone-method-for-testing-purity-karat-gold

About This Article

Kennon Young Co-authored by: Kennon Young Master Gemologist Appraiser This article was co-authored by Kennon Young. Kennon Young is a Master Gemologist Appraiser and the Owner of Vermont Gemological Laboratory in Burlington, Vermont. With over 20 years of experience in the industry, Kennon and his team specialize in handmade engagement rings, wedding bands, and custom jewelry. He attended the Revere Academy of Jewelry Arts, the Gemological Institute of America, and the Rhode Island School of Design Extension. He is a Jewelers of America (JA) Certified Bench Jeweler Technician and received the highest credential in the jewelry appraisal industry, the ASA Master Gemologist Appraiser, in 2016. This article has been viewed 914,459 times. 123 votes - 83% Co-authors: 12 Updated: July 7, 2025 Views: 914,459 Categories: Gold | Authenticating Jewelry Article SummaryX

To test gold at home, check your gold for a hallmark, with "GF" or "HGP" meaning its gold plated, while "24K" or another number means its real gold. Alternatively, find out if your item is gold plated by holding the piece under a light to see if it's fading at the edges. If you're still unsure, test the authenticity of your gold piece by holding it close to a magnet because real gold won't react. As a final test, drizzle some white vinegar on the surface and if the color changes, it's not real gold. For tips on how to acid test your gold, read on! Did this summary help you?YesNo

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Yes No Advertisement Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy. Kennon Young Co-authored by: Kennon Young Master Gemologist Appraiser Co-authors: 12 Updated: July 7, 2025 Views: 914,459 83% of readers found this article helpful. 123 votes - 83% Click a star to add your vote Abayomi F.

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"Thank you for being a good teacher. Finally, I got it; the step-by-step instructions were easy to understand." Tracy B.

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"I was just depending on someone else's words. Until I got this test I wasn't sure. Very helpful. Thank..." more Dre Terra

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