Maybe you inherited a gold chain, or found an old ring at the back of a jewellery box. Or perhaps you are thinking of selling a necklace and you want to know for sure whether it is really gold. Knowing how to test it yourself means you will walk into a shop with a rough idea of what you are holding, instead of guessing, before you sell your gold.
The good news is that you can narrow it down at home. Some home tests provide only basic clues, while others produce more reliable results. Below are eight tests you can run at home, which ones are worth trusting, and why a professional test is still the only way to be certain.
Quick Answer: How to Tell If Gold Is Real at Home
To tell if gold is real at home, start with the hallmark — look for 375, 585, 750 or a karat stamp. Then run the magnet test and the float test: real gold is not magnetic and sinks quickly in water. No single home test can prove a piece is genuine, so combine two or three, or get a professional XRF test.
First, Check the Hallmark (What If There’s No Stamp?)
Before doing any tests, check for a hallmark. Checking the hallmark is usually the first step in identifying real gold, and it takes seconds.
Hallmarks are usually found in these places:
- Inside the bands of rings
- On the clasps of necklaces
- On the tags attached to chains
- On the posts of earrings
A small magnifying glass can help you see the stamp clearly. You can also use the zoom feature on your phone to make it easier to read.
| Stamp | Karat | % Pure Gold |
|---|---|---|
| 375 | 9K | 37.5% |
| 417 | 10K | 41.7% |
| 585 | 14K | 58.5% |
| 750 | 18K | 75% |
| 916 | 22K | 91.6% |
| 999 | 24K | 99.9% |
In Canada, 9K gold stamped 375 is common.
You might also come across stamps like these:
- GP — Gold Plated
- GF — Gold-filled
- GE — Gold-electroplated
- RGP — Rolled Gold Plate
- HGE — Heavy Gold Electroplate
- HGP — Heavy Gold Plate
Gold-plated jewellery has only a thin layer of gold over another metal, while gold-filled jewellery contains a much thicker layer of gold bonded to a base metal. This difference matters a lot at resale — gold-filled pieces carry recoverable gold, while plated pieces carry almost none.
You also have to remember that stamps themselves can be faked. A hallmark that looks uneven, poorly stamped, or different in style from the rest of the jewellery may be a warning sign. If the stamp looks suspicious, run one or more home tests before reaching a conclusion.
If the stamp is unclear, clean the area gently and examine it again with a magnifying glass or your phone’s zoom. If you still cannot read it, move on to the home tests below. And if you do not see a stamp at all, do not assume the piece is fake. Antique, handmade, worn, or imported pieces sometimes carry no stamp. There is a full section on unmarked gold further down.
Test 1 — The Magnet Test
This is the easiest test, and it takes about five seconds.
How to do it:
- Hold a strong magnet, such as a neodymium magnet, close to the piece and watch for any pull.
What the results mean:
- If the piece sticks to a magnet, it is almost certainly not solid gold.
- If the magnet does not pull the piece towards it, then it may actually be gold. You will need to run further tests before you can be confident.
Limitation:
Real gold is not magnetic — but neither are some fake metals, including brass and copper. This test can help rule certain items out. It cannot prove that a piece is real gold. It works best as a first step because it is quick and easy, and the result should always be checked against another home test.
Test 2 — The Float / Density Test
Gold is a heavy metal, so a solid gold piece sinks to the bottom quickly.
How to do it:
- Fill a glass with water, then lower the piece in gently.
What the results mean:
- Solid gold sinks quickly because it is dense — roughly twice as heavy as most metals used to fake it.
- If the item floats or drifts down slowly, it may not be genuine. It could be made from a lighter metal, or it could be hollow or plated.
Limitation:
Some hollow gold jewellery can float, and some dense fake metals still sink to the bottom. This test is not perfect, which is why you should run others alongside it.
Test 3 — The Ceramic Scratch Test
This test gives you a useful clue, but it can also leave a mark on the piece.
How to do it:
- Gently drag the piece across the back of a ceramic tile that has not been glazed.
What the results mean:
- A gold-coloured streak is a point in the piece’s favour, though it is not conclusive — see the warning below.
- A black or grey streak usually means the item is made from base metals rather than gold.
Warning:
This test can scratch the jewellery, so always use a hidden area, and do not try it on valuable pieces. Also keep in mind that plated jewellery may leave a gold-coloured mark at first, simply because the gold sits on the outside of the piece — which is exactly why a gold streak on its own does not confirm solid gold.
Test 4 — The Skin (Discolouration) Test
Some people notice green or black marks on their skin after wearing certain pieces. This is not a reliable test on its own, but it can give you another hint.
How to do it:
- Wear the piece for a few hours — or a few days if you can — then check the skin underneath it.
What the results mean:
- Real gold does not usually leave marks on your skin.
- Black or green marks could mean the piece contains a lot of copper.
Limitation:
Sweat, lotions, and soaps can all change the outcome, and individual skin chemistry affects it too. Even real gold can occasionally cause a reaction. Treat this as a weak hint, not evidence either way.
Test 5 — The Vinegar Test (and Why It Barely Works)
The vinegar test is one of the most-recommended methods online for checking whether gold is real. Honestly, it barely works.
How to do it:
- Place a drop of vinegar on a hidden part of the piece and watch for any colour change.
What the results mean:
- If it visibly tarnishes or changes colour, it is not solid gold.
- If nothing happens, that proves nothing either way.
Limitation:
Vinegar is a weak acid — it is not strong enough to react with most of the base metals used in fake gold, so a piece can still be fake even when the vinegar does nothing at all. The vinegar test can help identify an obvious fake, but it cannot confirm authenticity. If you want a real answer at home, use an acid test kit instead.
Test 6 — The Acid Test Kit
An acid test kit is the most reliable method you can use at home. Most kits cost around CAD $30 to $80 as of 2026, and they can tell you both whether a piece is gold and roughly what karat it is.
How to do it:
- Gently rub the piece on the testing stone supplied with the kit.
- Apply the acid. Start with the lowest-karat acid and work upwards until the streak changes.
- Observe the streak to read the result.
What the results mean:
- If the streak remains, the gold is at least that karat.
- If the streak dissolves, the gold is a lower karat.
- Repeating the test with different acids lets you narrow down the karat.
Limitation:
The test leaves a small mark on the piece and uses chemicals. The result also depends on using the correct acid and following the instructions carefully. Because of the mark it leaves, it is not suitable for valuable jewellery or sentimental family pieces.
Safety:
Wear gloves and eye protection, and work in a well-ventilated area.
Test 7 — The Lighter / Flame Test
Many people search for how to tell if gold is real with a lighter, but this test comes with real risk.
How to do it:
- Use a butane lighter and apply an even flame to the piece for up to one minute.
What the results mean:
- Real gold does not discolour or tarnish under the flame.
- Fake jewellery gets darker, starts to smoke, or changes colour.
Warning:
This test carries real risk. The metal gets hot enough to burn you — use tongs or pliers, never bare fingers, and keep the flame away from stones or resin settings, which can crack or scorch. The flame test is also not a reliable way to identify real gold. The magnet, float, and acid tests are safer and more informative, so skip this one unless you have good reason.
Test 8 — Weigh-and-Measure (Density) Check
Because gold is a very dense metal, checking density can provide another hint.
How to do it:
- Weigh the piece.
- Measure its volume by noting the water level before and after placing the piece in the water. The difference is the volume.
- Divide the weight by the volume to calculate density.
What the results mean:
- Solid 24K gold has a density of approximately 19.3 g/cm³.
- A density far below what is expected may indicate a lighter base metal.
Limitation:
This method is not foolproof. Hollow jewellery can produce the same kind of misleading result, and a piece with stones set into it cannot be measured this way at all.
Which Tests Actually Work? (Reliability at a Glance)
No home test can confirm authenticity or karat with complete certainty. It is best to combine several methods.
| Test | How Much to Trust It | Main Limitation |
|---|---|---|
| Hallmark | Supporting | Stamps can be faked |
| Magnet Test | Rules out fakes only | Some fake metals are not magnetic |
| Float Test | Supporting | Hollow gold and dense fakes can mislead |
| Ceramic Scratch Test | Supporting | Can damage the jewellery |
| Skin Test | Weak signal | Sweat and lotions affect results |
| Vinegar Test | Rules out fakes only | No change does not prove gold |
| Acid Test Kit | Reliable | Leaves a tiny mark and uses chemicals |
| Density Check | Supporting | Not reliable for hollow or density-matched fakes |
The best approach is to run two or three tests one after another. Begin with the hallmark, then try the magnet and float tests. If you need more certainty, add an acid test kit.
Home tests are useful, but none of them confirm gold outright, and several can mislead you. If you need certainty, get a professional XRF test.
How to Tell If Unmarked Gold Is Real (No Hallmark)
Many people assume that jewellery without a stamp must be fake, but that is not always true. Old handmade pieces, imported jewellery, and heavily worn pieces often do not have visible stamps or hallmarks.
Start with the magnet and float tests, then move to an acid kit for a more reliable answer.
It is also worth examining the parts of the piece that show the most wear — the inside of a ring band, or the edge of a clasp. If you can see a silver-coloured or copper-coloured metal showing through under the surface, the piece is likely gold-plated rather than solid gold.
When there is no mark to work from, professional testing matters more. Home tests will narrow it down, but they will not settle it. To know for certain what an unmarked piece is made of, get a professional XRF test.
Why a Professional XRF Test Beats Every Home Test (Free In-Store)
Home tests are useful for narrowing things down, but they are not conclusive. An XRF test is the most accurate option because it reads the piece’s exact elemental composition without damaging it, and returns a result in seconds.
Unlike home tests, an XRF test does not rely on magnets, chemicals, or colour changes. That makes it especially useful for valuable jewellery, inherited pieces, and unmarked gold, where home tests tend to give uncertain results.
Why is it so effective?
- Non-destructive — no scratching, no chemicals, no mark left on the piece.
- It identifies the exact karat, not just whether the piece is gold.
- It removes the uncertainty that home tests leave behind.
Even well-made fakes and heavily plated pieces show up immediately under XRF.
Professional testing is important when it really counts:
- When you are thinking about selling your gold.
- If the piece is valuable or holds sentimental value.
- If the jewellery carries no stamp or mark.
- When your home tests give mixed or unclear results.
Before you sell your gold, consider getting a free XRF test at either of our Whitby or Burlington locations. It takes minutes, it will not damage the piece, and you will know exactly what you have before you make a decision.
Conclusion
If you want to know how to tell if gold is real, start by checking for a hallmark and running a couple of easy home tests. The magnet test and the float test are good places to begin. An acid test kit will take you further still. Even so, no home method can confirm karat with certainty.
If your home tests disagree with each other, or you are simply unsure about a piece, it is worth having it tested properly before you make any decision — particularly if the jewellery is valuable or inherited, or if you plan to sell gold jewellery. Book a free XRF test at our Whitby or Burlington location. It takes minutes, and it will not damage the piece.
Frequently Asked Questions
No. Pure gold is not magnetic, so real solid gold won’t stick to a magnet. If your piece is pulled toward or sticks to a strong magnet, it contains magnetic metal and isn’t solid gold. Be aware that some non-magnetic fakes, like brass and copper, also pass this test, so use it alongside other checks.
Only in a limited way. Household vinegar is too weak to reliably react with metals, so a “no change” result does not prove a piece is gold. Vinegar is useful only in reverse: if it visibly tarnishes or corrodes the metal, the piece is definitely not solid gold. For a real chemical test, use an acid testing kit instead.
Apply an even butane flame to the piece for up to a minute. Real gold brightens and won’t tarnish, while fakes tend to darken or smoke. Be warned that this test is high-risk — it can damage the piece and burn you — so never use it on valuable items. The magnet, float and acid tests are much safer.
No. Plenty of real gold has no hallmark, including antique, handmade, heavily worn and some imported pieces. A missing stamp just means you need to test the metal itself — start with a magnet, then the float test, then an acid kit. For a definitive answer on unmarked gold, an XRF scan is the fastest and most reliable option.
A professional XRF scan is the most accurate method. It reads the exact metal and karat in seconds without scratching or chemicals, and it can’t be fooled by plating or fakes. Among home tests, an acid test kit is the most reliable, but it still can’t match the precision of XRF — especially before selling a valuable or unmarked piece.