Gold jewellery buying is full of jargon — karats, hallmarks, vermeil, filled — and most buyers don’t know what any of it means until after they’ve spent money. These are the straight answers to the questions that actually matter.
What Do Gold Karat Numbers Mean?
Karats measure gold purity. Pure gold is 24 karats. Every number below that tells you what fraction of the metal is actually gold — the rest is alloy: copper, silver, zinc, or nickel.
| Karat | Gold Content | Hallmark Stamp | Best For | Durability |
|---|---|---|---|---|
| 24K | 99.9% | 999 | Investment bars, bullion | Very soft — scratches easily |
| 22K | 91.7% | 916 | Traditional and bridal jewellery | Soft — not ideal for daily wear |
| 18K | 75% | 750 | Fine jewellery, engagement rings | Good — holds shape well |
| 14K | 58.3% | 585 | Everyday rings, bracelets, chains | Excellent — most durable option |
| 9K | 37.5% | 375 | Budget-conscious buyers | Very durable but paler colour |
Why 24K Gold Is the Wrong Choice for Wearable Jewellery
Pure gold is beautiful but practically useless as jewellery you actually wear. It bends and dents under normal daily use. Cartier sets the iconic Love Bracelet in 18K for exactly this reason — rich purity, still structurally sound. If a seller is pushing 24K rings or bracelets as a premium everyday option, that’s a sign they don’t understand what they’re selling.
Is Higher Karat Always Better?
No. Higher karat means more gold, which means softer metal and more prone to scratching and bending. For a ring worn every day, 14K is arguably the smartest choice — more durable and significantly cheaper per gram than 18K. Mejuri’s best-selling everyday pieces are 14K solid gold, and they’ve priced that sweet spot correctly. 18K makes sense for special occasion jewellery or when the deeper, richer yellow tone matters more than toughness.
How to Tell If Gold Jewellery Is Real
Fakes have gotten convincing. Here’s how professionals verify gold — and what you can do before spending serious money.
What Hallmarks Should I Look For?
Every legitimate piece of gold jewellery sold in the UK, EU, and most regulated markets carries a hallmark — a tiny stamped code verifying the metal. Look for it on clasps, inner bands, or the back of pendants. The numbers to know: 375 (9K), 585 (14K), 750 (18K), 916 (22K), 999 (24K). In the UK, Assay Office stamping is a legal requirement for pieces over a certain weight. No stamp means no independent verification — and that’s a problem worth taking seriously.
Can I Test Gold at Home?
- Magnet test: Real gold is not magnetic. Hold a strong magnet near the piece — if it pulls, the base metal is ferrous.
- Acid test kits: Available for £15–£25 online. Scratch the metal on a testing stone, apply nitric acid, read the reaction. Different karats react differently. Accurate when done correctly.
- Skin discolouration: Real gold doesn’t turn your skin green. Green marks mean brass or copper beneath thin plating.
- Float test: Gold is dense at 19.3 g/cm³ — it sinks immediately in water. Not definitive on its own, but a useful quick check.
When to Get Professional Verification
For anything over £200, take it to a certified jeweller or one of the UK Assay Offices in Birmingham, London, Edinburgh, or Sheffield. A professional XRF (X-ray fluorescence) scanner reads exact metal composition without touching the piece. The service typically costs £10–£50 and is worth every penny before buying second-hand or vintage pieces from private sellers.
Yellow, White, and Rose Gold: A Direct Answer
For most people buying their first solid gold piece, 18K yellow gold is the right starting point. No coatings, no required maintenance, and the warm tone ages well with the metal itself.
White gold requires rhodium plating to achieve that bright silver look. That coating wears off — expect replating every one to three years at a cost of £50–£150 per service. Rose gold gets its pink tone from copper content, which is fine unless you have a copper sensitivity. Yellow gold at 18K is the metal in its most natural state: what you see on day one is what you get decades later.
When White Gold Is the Right Call
White gold pairs better with diamonds. The neutral tone doesn’t cast a yellow reflection onto the stone, which matters significantly with colourless or near-colourless grades. Tiffany & Co. and most luxury houses set their higher-grade diamonds in platinum or white gold for exactly this reason. If an engagement ring is the goal and the diamond quality is high, white gold — or platinum if budget allows — is the smarter aesthetic choice.
Rose Gold and Trend Risk
Rose gold dominated the 2010s. Pandora leaned into it heavily; so did Cartier with rose gold Trinity pieces. It remains beautiful. But it reads trend-forward rather than timeless in a way yellow and white gold don’t. Buying something you want to wear for 20 years? That’s worth a moment’s consideration before committing.
Gold-Plated, Gold-Filled, and Solid Gold: The Actual Differences
This is the confusion that costs people real money. These three terms describe fundamentally different products at completely different quality and price levels — not different grades of the same thing.
Gold-Plated: What the Thin Layer Really Means
Gold-plated jewellery has gold electrochemically deposited onto a base metal — usually brass or copper. The gold layer is typically 0.5 microns thick. That’s 0.0005 millimetres. It will wear off. How fast depends on your skin’s acidity, how often you wear it, and exposure to sweat, water, and perfume. A cheap plated ring might start fading within weeks. A higher-quality piece with a 1–2 micron layer might hold for one to two years with careful wear.
Gold vermeil is a regulated subtype: at least 2.5 microns of gold over sterling silver specifically (not base metal). Mejuri sells both gold vermeil and solid gold lines and is explicit about which is which in their product descriptions — worth using as a benchmark for how transparent sellers should be. Vermeil holds up better than standard plating, but it still wears through eventually.
Gold-Filled: The Honest Middle Ground
Gold-filled jewellery contains a legally defined minimum of 5% gold by total weight, mechanically bonded to a base metal core using heat and pressure. Because the gold is bonded rather than electrodeposited, it doesn’t flake off the way plating does. A well-made gold-filled piece can genuinely last 10–30 years with proper care.
Look for stamps like “14/20 GF” — meaning 14K gold makes up 1/20th (5%) of the total weight. The US regulates this term strictly. Standards vary in other markets, so check country-specific labelling rules before assuming the term means the same thing everywhere.
Solid Gold: What the Term Actually Guarantees
Solid gold means the same alloy runs all the way through — no base metal core, no surface coating. A solid 14K gold ring is 58.3% gold throughout. It won’t tarnish, it won’t change colour as it wears, and it can be resized, repaired, and polished indefinitely. It’s also the only type that holds any resale value as metal.
The price gap is real. A solid 14K gold chain from Monica Vinader or Mejuri might run £150–£500. A gold-plated version of a similar design costs £20–£50. On day one, they look identical. Within six months, they don’t.
How to Clean and Store Gold Jewellery Without Wrecking It
Gold is chemically stable. The alloys mixed into it are less so. Cleaning correctly takes five minutes and extends a piece’s life by years.
- Warm water and mild dish soap: A few drops in warm (not hot) water. Soak the piece for 15–20 minutes.
- Soft brush: A baby toothbrush reaches settings and crevices without scratching. Scrub gently and evenly.
- Rinse thoroughly: Soap residue dulls the finish. Rinse under warm running water — not into a plugged sink where pieces can vanish.
- Pat dry: Use a soft, lint-free cloth. Let the piece air-dry completely before storing.
- Store separately: Gold scratches against other metals. Individual pouches or a sectioned jewellery box eliminates surface damage.
What to Avoid Completely
- Chlorine: Pool and hot tub water weakens gold alloys over time, especially at elevated temperatures. Remove gold before swimming.
- Toothpaste: Widely recommended online. It’s mildly abrasive and will micro-scratch polished gold surfaces. Skip it.
- Perfume and hairspray: Apply these first, let them dry, then put the jewellery on — not the other way around.
The Single Most Common Gold Buying Mistake
Paying solid gold prices for gold-plated jewellery. Ambiguous product listings use the word “gold” without specifying the type — and most buyers don’t know to ask. Before purchasing anything described simply as a “gold necklace” or “gold ring,” check the listing for these exact words: solid gold, gold-filled, gold vermeil, or gold-plated. If none of those terms appear anywhere in the description, that omission is your answer.
Does Gold Jewellery Actually Hold Its Value?
Only solid gold pieces hold intrinsic metal value — and even then, calling jewellery an “investment” requires some nuance.
Gold trades around £65–£75 per gram in 2026. A solid 18K gold ring weighing 5 grams contains roughly 3.75 grams of pure gold — about £245–£280 in raw metal value. A reputable jeweller or bullion dealer might buy it back at 70–90% of melt value. That’s not a strong financial return, but it’s real money and recoverable. Gold-plated and gold-filled pieces have essentially zero scrap value by comparison.
When Designer Gold Jewellery Beats the Spot Price
Vintage and signed pieces from Van Cleef & Arpels, Bvlgari, and Cartier regularly sell at auction for multiples of their melt value. A 1970s Cartier Trinity Ring in 18K tri-gold sells for £800–£2,000+ on the secondary market depending on condition and provenance documentation. Brand recognition, design rarity, and collector demand drive those prices — not gold content alone. The metal is almost incidental at that point.
Gold Jewellery vs. Bullion: The Real Tradeoff
If financial return is the primary motivation, bullion — bars or coins from a recognised dealer — is the cleaner route. No retail making charge built into the price for craft and design, and buying and selling is straightforward. Every jewellery piece carries a premium for aesthetics that you almost never fully recover on resale. Buy jewellery because you want to wear it. Buy bullion if you want actual gold market exposure in your portfolio.
