Is Gold or Silver Magnetic? The Science Explained

Pure gold and pure silver are not magnetic in the way most people mean when they ask the question. Both metals are diamagnetic, which means they are very slightly repelled by a magnetic field rather than attracted to it. If you hold a strong magnet up to a gold bar or a silver coin, you will not feel any pull. The repulsion is so faint that you would need sensitive lab instruments to detect it. Yet the full story is more interesting than a flat “no,” because at extremely small scales, both metals can behave in surprisingly magnetic ways.

What Diamagnetic Actually Means in Practice

Most materials fall into one of three broad magnetic categories. Ferromagnetic materials, like iron or nickel, are strongly attracted to magnets and can themselves become magnetized. Paramagnetic materials are weakly attracted. And diamagnetic materials are weakly repelled. Gold and silver both land in the diamagnetic camp, alongside copper, bismuth, and water.¹

The diamagnetic effect in gold and silver is incredibly weak. It arises because an external magnetic field slightly alters the motion of electrons orbiting each atom, creating a tiny opposing field. Every material has this effect, but in ferromagnetic and paramagnetic materials it is drowned out by much stronger attractive forces. In gold and silver there is nothing stronger to override it, so the weak repulsion is all you get. For any everyday purpose, you can treat gold and silver as nonmagnetic.

This is why the “magnet test” is one of the simplest first checks when someone suspects a piece of jewelry or a bullion coin might be fake. If a refrigerator magnet sticks firmly to your gold ring, the ring almost certainly contains a significant amount of iron, nickel, or cobalt underneath a thin gold plating. The test is not foolproof, since some non-precious metals are also nonmagnetic, but a strong magnetic attraction is a reliable red flag.

Why a Magnet Slides Slowly Down Silver

Silver has a quirk that sometimes leads people to think it is slightly magnetic. If you slide a strong neodymium magnet down a tilted silver bar, the magnet visibly slows as it descends, as though the silver is putting up resistance. This is not magnetism in the conventional sense. It is an electromagnetic braking effect. Silver is the most electrically conductive metal on Earth, and when a magnet moves across a conductor, it induces swirling electric currents (called eddy currents) in the metal. Those currents generate their own magnetic field that opposes the motion of the magnet, creating a braking force. The magnet never sticks; it simply moves more slowly than it would sliding down a piece of glass or wood.

This same effect works with copper and aluminum, but silver’s superior conductivity makes the braking especially pronounced. Coin dealers and bullion collectors actually use this “slide test” as a quick authenticity check for silver bars and coins. A magnet that races down without slowing suggests the item is not silver. A magnet that almost crawls suggests high silver content. Gold also conducts electricity well, so you can observe a milder version of the same effect with thick gold bars, but it is less dramatic because gold’s electrical conductivity is lower than silver’s.

When Gold Becomes Magnetic at the Nanoscale

One of the more surprising findings in materials science over the past two decades is that gold, famously nonmagnetic in bulk, can become genuinely magnetic when shrunk down to nanoparticle size. Researchers discovered that thiol-capped gold nanoparticles roughly 1.4 nanometers across display permanent magnetism, including magnetic hysteresis, at room temperature. The effect arises because the chemical bond between gold and sulfur atoms in the thiol coating creates localized “holes” in gold’s outer electron shell. Those holes behave like tiny magnets, and gold’s strong spin-orbit coupling locks them in place, producing a stable ferromagnetic-like state.²

The type of coating matters enormously. Follow-up work showed that gold nanoparticles capped with dodecanethiol, which has a straight-chain molecular structure with a well-defined symmetry axis, display ferromagnetic-like behavior. Meanwhile, nanoparticles capped with a different molecule called tiopronin behave paramagnetically, and particles protected by tetraalkyl ammonium remain diamagnetic, just like bulk gold. The straight-chain capping molecules appear to induce orbital momentum in the surface electrons near the binding site, contributing both to the magnetization and to the local magnetic stiffness that makes the effect permanent.³

This is a genuinely counterintuitive result. The magnetism is not from impurities or contamination. It emerges from the way the gold atoms bond to specific surface molecules at a scale where quantum effects dominate and bulk material rules no longer apply. The finding has been reproduced by multiple groups and is well-established in the nanoscience literature, though it remains an active area of research because the exact mechanisms are still being refined.

Silver Nanoparticles Show Similar Surprises

Silver follows a parallel story. Bulk silver is firmly diamagnetic, but when reduced to nanoparticle form, it too can display unexpected magnetic behavior. Biosynthesized silver nanoparticles analyzed with vibrating-sample magnetometry have been shown to exhibit soft ferromagnetic-like behavior at room temperature.⁴ “Soft” in this context means the particles magnetize and demagnetize easily, without requiring a strong external field, which distinguishes them from the hard ferromagnetism of something like a steel magnet.

The mechanism in silver nanoparticles is analogous to what happens in gold. At the nanoscale, a large fraction of atoms sit on the surface rather than in the interior, and the electronic environment at the surface differs from the orderly crystal lattice of bulk metal. Surface atoms bonded to capping agents or biological molecules can develop unpaired electron states that would never exist in a macroscopic piece of silver. These unpaired states give rise to localized magnetic moments. It is worth stressing that the effect is real but tiny in absolute terms. You will never build a refrigerator magnet out of silver nanoparticles. The significance lies in what it reveals about how metals behave when their dimensions approach atomic scales.

How Alloying and Impurities Affect What You Feel

Most gold and silver items people encounter in daily life are not pure. Jewelry is typically alloyed with other metals for strength and durability. This is where the practical magnetism question gets relevant. Pure 24-karat gold is nonmagnetic, but 14-karat gold is only about 58% gold, with the remaining 42% being a mix of other metals. If that mix includes nickel, iron, or cobalt, the resulting alloy can show noticeable magnetic attraction. White gold, for instance, is often alloyed with nickel to achieve its color, and some white gold pieces will indeed respond to a magnet.

Sterling silver is 92.5% silver and 7.5% other metals, usually copper. Copper is diamagnetic like silver, so genuine sterling silver should not be attracted to a magnet. However, cheaply made items marketed as silver sometimes substitute iron-based metals or are merely silver-plated over a magnetic core. This is precisely why the magnet test works as a fraud detection tool, not because gold and silver have interesting magnetic properties themselves, but because the materials commonly used to fake them often do.

Platinum and palladium, two other precious metals people sometimes confuse with silver, are paramagnetic, meaning they are weakly attracted to magnets.¹ The attraction is subtle and nothing like what you feel with iron, but it is detectable with a strong enough magnet. If you are trying to identify an unknown white metal, its response to a magnet can help narrow the possibilities, though it will not give you a definitive answer on its own.

The Magnet Test and Its Limits

Using a magnet to check precious metals is popular because it is fast, free, and requires no special equipment. But it has real limitations that are worth understanding if you are buying gold or silver.

False negatives: A fake item made from nonmagnetic metals like brass, tungsten, or lead will pass the magnet test even though it contains no precious metal at all. Tungsten is a particular concern for counterfeit gold bars because its density is almost identical to gold’s, making it hard to detect by weight alone, and it is nonmagnetic.
False positives: Legitimate gold jewelry containing small amounts of ferromagnetic alloying metals may show a faint magnetic response without being fake. A slightly magnetic 10-karat gold ring is not necessarily counterfeit; it may simply have nickel in the alloy.
Strength matters: A weak refrigerator magnet will not produce enough force to test anything meaningfully. Serious precious metal testing uses strong rare-earth magnets, typically neodymium, which produce enough field strength to reveal subtle paramagnetic or ferromagnetic contamination.

The magnet test is best used as a screening tool rather than a definitive assay. Professional testing combines it with other methods like acid testing, X-ray fluorescence, specific gravity measurement, and electrical conductivity tests to determine composition accurately.

Gold-Magnetic Composites in Medicine

Gold’s nonmagnetic nature turns out to be an advantage in biomedical engineering, paradoxically, when it is combined with materials that are strongly magnetic. Researchers have developed composite nanoparticles that pair a magnetic iron oxide core with a gold shell. The iron oxide provides the magnetic functionality, allowing the particles to be guided through the body using an external magnet or heated using an alternating magnetic field for a technique called magnetic hyperthermia. The gold shell provides biocompatibility, since gold is chemically inert in the body, and opens the door to additional therapies like photothermal treatment, where near-infrared laser light heats the gold coating to destroy tumor cells.

One research group created gold-decorated magnetic nanoparticles that showed very low toxicity to cells in laboratory tests and could serve as nanoheaters for magnetic hyperthermia while also being a platform for attaching other functional molecules to their surface.⁵ Another team developed multifunctional magnetic gold nanoparticles designed to deliver drugs directly to a tumor site using magnetic targeting, produce heat via laser absorption to kill cancer cells, and serve as contrast agents for MRI imaging, effectively combining diagnosis and treatment in a single particle.⁶ Others have loaded the anticancer drug doxorubicin onto gold-coated iron oxide nanoparticles for a dual approach combining hyperthermia with controlled drug release.⁷

These are still largely at the research stage rather than in routine clinical use, but they illustrate how the properties of gold and magnetic materials complement each other. Gold’s chemical stability and optical properties do things that iron oxide alone cannot, while iron oxide’s magnetism does things that gold alone cannot. The hybrid is more useful than either component on its own.

How Gold Behaves in Strong Magnetic Fields

Even though gold is nonmagnetic in the everyday sense, it is not invisible to magnetic fields. In physics experiments using very strong fields, gold’s electrical conductivity produces measurable effects. When a gold thin film is placed in a transverse magnetic field, the moving charge carriers inside the metal are deflected sideways, creating a voltage difference across the film known as the Hall voltage. Measurements on gold thin films have shown that the Hall voltage and Hall resistance increase linearly with field strength up to at least 4.5 tesla, which is about the strength of a clinical MRI machine.⁸

This has practical relevance for people with gold dental work or gold-containing implants who need an MRI. Gold itself does not get pulled by the MRI’s powerful magnet, and it does not heat up dangerously the way ferromagnetic metals can. Most gold dental restorations and orthopedic hardware are considered MRI-safe for this reason. The main concern is always whether the “gold” item actually contains other metals that are ferromagnetic. A gold crown that is in reality a base-metal alloy with gold plating could pose a problem, not because of the gold, but because of whatever is underneath it.

Why Gold’s Color Relates to the Same Physics

Gold’s distinctive yellow color and its diamagnetic behavior both trace back to the same underlying atomic physics: relativistic effects on its electrons. Gold is heavy enough that its innermost electrons orbit the nucleus at a substantial fraction of the speed of light. This causes those inner electron orbitals to contract, which in turn pushes the outer electron energy levels closer together. The narrowed energy gap between certain outer orbitals is what makes gold absorb blue light and reflect yellow, giving it that warm color instead of the silvery sheen you would expect from a metal. Silver, being lighter, has weaker relativistic effects, which is why it reflects all visible wavelengths fairly equally and appears, well, silver.

These same relativistic effects influence gold’s magnetic behavior. The strong spin-orbit coupling in gold, measured at about 1.5 electron-volts, is what locks the magnetic moments in place when nanoscale gold particles develop them through surface bonding.² Silver’s spin-orbit coupling is significantly weaker, which is one reason its nanoscale magnetism tends to be softer and less persistent. In a sense, the same physics that makes gold look different from silver also makes its nanoscale magnetism behave differently. The two metals are close neighbors on the periodic table with similar electronic structures, but that extra weight in gold’s nucleus changes everything from its color to its chemistry to how it responds to magnetic fields at the smallest scales.