What Is the Magnet Test for Gold?

Gold jewellery usually gets handed down from generation to generation, and, sooner or later, every owner begins to question the authenticity of the item he or she owns. Testing goldusing a magnet is one of the easiest ways to start your tests, since it requires no money and just a few seconds. The principle of its functioning is quite simple, since pure gold is diamagnetic and does not attract any magnetic force, so that any piece that starts to adhere to a magnet has iron or nickel in its composition and cannot be real gold. On the other hand, such materials as copper and brass are also immune to magnets. For that reason, the magnet test works well as a first check, followed by a hallmark inspection and a density check. This guide breaks down the scientific concept behind this test, how to conduct this test on gold correctly, what is the expected reaction of each karat, and where this test fails.

Why Pure Gold Does Not Stick to a Magnet

The reason behind magnetism is simply the way electrons exist within a metal. In iron, nickel, and cobalt, for example, electrons align in one direction, generating a magnetic field, which results in these materials moving towards a magnet. The gold element is different due to the way in which its electrons are arranged in pairs that negate each other, resulting in a complete lack of magnetic field formation. This feature of gold is known as diamagnetism, meaning that gold slightly repels the magnetic field.

This action seems similar to a game of tug-of-war where all individuals holding the rope have partners who pull from the opposite side, so that the rope does not move. In this case, even a very strong neodymium magnet will show no attraction when held against a 24-karat gold bar, meaning that anything else but gold pulls toward the magnet.

How to Do the Magnet Test at Home - Step by Step

The home gold magnet test can be completed within less than a minute provided that one uses the appropriate magnet. This procedure consists of the following actions:

1. One should have a powerful rare-earth (neodymium) magnet since a regular fridge magnet will be insufficient to detect any magnetism in metal alloys. A neodymium magnet having at least 5 kg pulling power is often utilized.
2. One should put the gold item on a flat surface made of some non-metallic material like wood.
3. One should hold the magnet about 1-2 cm away from the gold and pay attention to its movements.
4. If the item starts moving toward the magnet or attaching itself to it, this indicates that it contains iron or nickel and hence is not made of gold.
5. No reaction at all is a pass, and the next check follows: a hallmark inspection or a density test.

The choice of magnet matters more than most people expect. There are some fakes that do not contain a significant number of magnetic metals and thus cannot be found using a weak magnet. Neodymium magnets are cheap and easily accessible in hardware stores and online stores.

Magnet Test Results by Gold Karat - What to Expect

Different karats mix gold with different metals, and that changes what the magnet test can and cannot reveal. The table below maps gold karat to the expected result.

Note: All figures are indicative. Actual amounts, fees, coverage percentages, and eligibility criteria may vary depending on the lender, borrower profile, loan category, and applicable guidelines at the time of application.

Two questions come up again and again. The first one is whether 18k gold attracts magnets, where real 18k gold made up of copper and silver alloy does not attract magnets, while white gold containing nickel as an alloying metal used to make the gold look white can attract magnets very slightly. The second one is whether 22k gold attracts magnets, and the answer is no since the alloy component of 22k gold, which is only 8.4% makes up copper and silver, which do not attract magnets.

Why the Magnet Test Can Give a False Result

The test fails in two directions, and both matter.

The first failure is a piece that reacts even though its surface is gold. Gold-plated jewellery built over an iron or nickel core will jump at the magnet despite the genuine gold layer on top. Here the magnet actually does its job, exposing the cheap core beneath the plating.

The second failure is the false pass, and this one catch people out. Copper, brass, aluminium, non-magnetic stainless steel and lead all ignore a magnet just as gold does. A fake cast entirely from brass will glide past the magnet test looking every bit as convincing as a genuine bangle. That is why no jeweller, or lender treats the magnet test as final; it is a useful first filter that rules out iron-based fakes in seconds, and nothing more than that.

What to Do After the Magnet Test - A 3-Step Home Check

A sensible home check for anyone wondering how to test gold purity at home runs in a chain of three, each step catching what the previous one missed.

Step one is the magnet test itself, which rules out iron and nickel fakes. Step two is a hallmark check: a magnifying glass reveals the BIS hallmark stamp on the inner band or clasp, with 916 marking 22k gold and 750 marking 18k under the official Indian standard. The third step involves testing for gold density. In a glass of water, gold will sink very quickly, as its density is close to 19.3 g/cc, whereas less dense metals will float or sink slowly.

Where valuable items are concerned, an official purity test done by an accredited jeweller, with the help of XRF analysis or acid test, would be most accurate. Home tests just serve to whittle down the options.

Gold Purity and Gold Loans: Where IIFL Finance Fits In

Knowing the approximate purity of household gold helps in a practical way when funds are needed against it. IIFL Finance may offer a gold loan against eligible ornaments, subject to product availability, borrower eligibility, collateral assessment and prevailing regulatory requirements, and the process generally works as follows:

• The lender's valuer weighs each piece and runs an independent purity check in the borrower's presence, so a home magnet test done earlier simply helps the owner form realistic expectations of what the valuation may show.
• The loan amount is tied to the applicable RBI loan-to-value limits rather than the full assessed value of the gold.
• Pledged ornaments are held in safe custody through the tenure, and applicable charges are provided in writing before the agreement is signed.
• On full repayment, the collateral is required to be released within seven working days under the RBI directions.

Conclusion

The magnet test for gold is fast, free and genuinely useful, but only for what it can actually detect, which is iron and nickel. A piece that sticks to a magnet is a clear warning, while a pass proves nothing on its own, since copper and brass fakes sail through untouched. Combined with a BIS hallmark check and a density test, it forms a sound first screen, with a certified jeweller's purity check as the final word for anything valuable. For owners who may wish to raise funds against their gold rather than sell it, IIFL Finance may offer a gold loan against eligible ornaments, subject to product availability, borrower eligibility, collateral assessment and prevailing regulatory requirements, and the nearest branch can share current product details and applicable charges. Valuation procedures, disclosures, and collateral handling are carried out in accordance with applicable policies and regulations.

Disclaimer : The information in this blog is for general purposes only and may change without notice. It does not constitute legal, tax, or financial advice. Readers should seek professional guidance and make decisions at their own discretion. IIFL Finance is not liable for any reliance on this content. Read more