Hallmarks on Jewellery: What 925, 585 and 750 Mean and How to Read Them

Three Tiny Marks That Tell the Truth

On the inside of a ring, there are marks. Small, barely legible without a magnifying glass. Most people never notice them. Those who do notice don't always understand what they mean.

These marks are hallmarks. They tell you how much precious metal is in the alloy. 925 on a silver ring means 92.5% of the alloy is pure silver. 585 on a gold ring means 58.5% pure gold. 750 means 75%. The rest is other metals that make the alloy harder, stronger and wearable.

A hallmark is not marketing. In the United Kingdom, it is the law. The Hallmarking Act 1973 makes it a criminal offence to describe an article as being made of gold, silver or platinum unless it has been hallmarked by an authorised assay office. A fake hallmark carries a penalty of up to ten years in prison. When you see "925" on a piece of jewellery bought from a legitimate British retailer, it is not the seller's opinion. It is a fact verified by an independent testing authority.

But there are nuances. Many nuances. And this guide covers all of them.

Silver: 925, 958, 999

925 - Sterling Silver

The most common silver standard in jewellery. 92.5% silver + 7.5% other metals (usually copper). The name "sterling" comes from the English currency - the pound sterling was originally a pound weight of this grade of silver.

Why copper. Pure silver is too soft. You could make a ring from it, but it would deform within a week of daily wear. Copper adds strength, making the metal practical for everyday jewellery. 7.5% copper strikes a balance: enough for durability, not enough for the metal to lose its silvery colour and lustre.

Tarnish. The copper in 925 silver causes the darkening. Copper reacts with sulphur in the air, producing copper sulphide - a dark layer. Pure silver also tarnishes, but more slowly. More on dealing with this - tarnish: how to restore.

Rhodium plating. Many 925 silver pieces are coated with a thin layer of rhodium - a platinum-group metal that does not tarnish. Rhodium-plated silver is brighter, whiter and doesn't darken while the coating lasts. But rhodium wears away over time (6-18 months with daily wear).

British hallmark. On sterling silver, you will see the lion passant (a walking lion) - this has been the standard mark for sterling silver in England since the 14th century. In Scotland, the mark is a lion rampant (standing on hind legs). In addition, the assay office mark and the fineness number (925) will be present.

More detail - complete guide to silver 925.

958 - Britannia Silver

95.8% silver. A higher standard than sterling, introduced in 1697 to prevent the melting of sterling silver coinage into plate. The hallmark is a figure of Britannia. Used today mainly by specialist silversmiths for high-quality flatware and artisan pieces.

999 - Fine Silver

99.9% silver. Too soft for jewellery - it dents with finger pressure. Used for investment bars and coins, not rings. If someone sells you a "fine silver 999 ring for daily wear," it is either a misrepresentation or a ring that will lose its shape within a month.

Gold: 375, 585, 750, 916, 999

375 - 9 Carat

37.5% gold. The minimum standard that may legally be described as "gold" in the United Kingdom. This is a distinctly British standard - many other countries do not recognise 9 carat as gold at all. In Germany, the minimum is 8 carat (333). In France and Italy, the minimum is 18 carat (750) for most retail purposes.

Characteristics. Pale colour (less than half is gold), high durability (lots of alloying metals = hard alloy), relatively affordable. May cause allergic reactions because the alloy often contains nickel.

585 - 14 Carat

58.5% gold. Popular in much of Europe and the standard in the United States (marked as 14K). Less common in British high-street jewellery than 9 carat, but widely available.

Colours of 585 gold:

• Yellow: gold + silver + copper. Classic warm colour.
• White: gold + nickel or palladium. Silvery colour. The nickel variant may trigger allergies. Palladium does not, but costs more.
• Rose (red): gold + copper (more than in yellow). The more copper, the redder the hue.

750 - 18 Carat

75% gold. The international luxury standard. Cartier, Tiffany, Bulgari work predominantly with 750. In the UK, this is the standard for fine jewellery and engagement rings from established jewellers.

Characteristics. Rich, deep colour. Softer than 585 (more gold = softer). More expensive. Less prone to tarnish.

585 vs 750: visually, the difference is noticeable - 750 is brighter, warmer, richer in colour. By price, 750 is roughly 30-50% more expensive than 585 for the same weight.

916 - 22 Carat

91.6% gold. The standard in India and the Middle East. Very soft, intensely yellow, expensive. Too soft for everyday rings and bracelets (they deform). For ceremonial jewellery worn on special occasions - ideal.

999 - Pure Gold (24 Carat)

99.9% gold. Egg-yolk yellow, soft as wax. Scratches with a fingernail. Not used for wearable jewellery (except coins and bars). If sold as a "daily wear ring in 999 gold," the seller is misleading you.

The Carat vs Fineness System

Fineness (millesimal). Used in continental Europe and most of the world. The number represents the parts per thousand of pure metal. 585 = 585 out of 1,000 parts = 58.5%.

Carat system. Used in the UK, US and Canada. 24 carats = pure gold. 18 carats = 18/24 = 75%. 14 carats = 14/24 = 58.3%.

Note: "carat" (gold purity) and "carat" (diamond weight) are homonyms. An 18-carat gold ring and an 18-carat diamond are entirely different things. Gold carat = purity. Diamond carat = weight (0.2 grams). In American English, the distinction is sometimes made with spelling: karat (gold) vs carat (gemstones).

The British Hallmarking System

Britain has the oldest compulsory hallmarking system in the world. It dates to 1300, when King Edward I decreed that all silver sold in London must contain at least 92.5% pure silver and be tested at Goldsmiths' Hall - the Hall of the Worshipful Company of Goldsmiths. The English word "hallmark" comes literally from "mark from the Hall."

The reason was pragmatic: goldsmiths were cheating. They diluted silver with cheaper metals and sold it at the price of pure silver. Buyers could not tell the difference. A state-controlled hallmark solved the problem: if the piece bears the assay office mark, the composition has been tested. You can trust it.

The Four Marks

A full British hallmark consists of up to four marks, stamped together:

1. The Sponsor's Mark (Maker's Mark). The initials of the manufacturer or sponsor, in a distinctive shield shape. This identifies who made or submitted the piece for hallmarking.

2. The Fineness (Standard) Mark. This indicates the precious metal and its purity:

• Lion passant = sterling silver (925) in England
• Crown followed by fineness number = gold (e.g., 750 for 18 carat)
• Orb = platinum

3. The Assay Office Mark. This identifies which office tested and hallmarked the piece:

• Leopard's head = London (Goldsmiths' Hall, operating since 1300)
• Anchor = Birmingham (operating since 1773)
• Rose = Sheffield (operating since 1773)
• Castle = Edinburgh (operating since 1457)

The London leopard's head is the oldest assay office mark in continuous use anywhere in the world. If your ring carries a leopard's head, it was tested at the same institution that has been testing precious metals for over 700 years.

4. The Date Letter (optional since 1999). A letter in a specific font and shield shape indicating the year of hallmarking. Each assay office had its own cycle of letters. Date letters are still used by some offices but are no longer compulsory.

The Hallmarking Act 1973

This is the law that governs hallmarking in the United Kingdom today. Key points:

• It is illegal to describe an unhallmarked article as gold, silver or platinum in trade.
• Exemptions exist for items below certain weight thresholds: articles under 1 gram for gold, 7.78 grams for silver and 0.5 grams for platinum do not require hallmarking.
• The Act applies to England, Wales, Scotland and Northern Ireland.
• Imported jewellery must be hallmarked by a UK assay office before it can be sold as precious metal.

Post-Brexit Changes

Since Brexit, UK hallmarks are no longer automatically recognised by EU member states. Jewellery hallmarked in Birmingham and sold in France would need to be re-hallmarked by a French bureau de garantie. However, the UK remains a member of the Vienna Convention on the Control of the Fineness and Hallmarking of Precious Metals, which means UK hallmarks are recognised by other Convention signatories (including Austria, the Netherlands, Sweden and others).

Platinum: 850, 900, 950

Platinum is the most expensive jewellery metal. Heavier than gold (density 21.45 vs 19.3 g/cm3), stronger, more corrosion-resistant, hypoallergenic.

950 - The Standard

95% platinum + 5% other metals (iridium, ruthenium, cobalt). The most common platinum standard for jewellery. Expensive. Very expensive.

The British hallmark for platinum 950 is an orb (a circle with a cross on top) plus the number 950. Platinum hallmarking became compulsory in the UK in 1975.

Stainless Steel: No Hallmark, But Not Without Standards

Stainless steel is not hallmarked because it is not a precious metal. But it has its own standards.

316L

The most common "jewellery grade" steel. Composition: iron + chromium (16-18%) + nickel (10-14%) + molybdenum (2-3%) + carbon (less than 0.03%, hence the "L" for Low carbon). Marked as "316L," "Surgical Steel" or "Stainless Steel."

Not to be confused with 304. 304 steel is also stainless but lacks molybdenum. Less resistant to corrosion, especially in salt water. 316L is the standard for jewellery and medical instruments. 304 is for kitchen equipment.

More detail - brass, steel and silver comparison.

How to Read a Hallmark

At Home (approximate)

Visual inspection. Take a loupe (10x magnification). Look for marks on the inside of a ring, on the clasp of a chain, on the post of an earring, on the plate of a bracelet clasp. Hallmarks are small - typically 1-2 mm. Without magnification, you may miss them entirely.

Magnet test. Hold a fridge magnet near the piece. Gold, silver and platinum are not magnetic. If it sticks, it is not a precious metal (or contains a significant proportion of iron). But: 316L stainless steel is also weakly magnetic or non-magnetic. A magnet rules out crude fakes but not all of them.

Smell test. Silver and gold have no smell. Brass and copper have a characteristic metallic odour. If a ring smells of "old coins," it is not precious metal.

Sound test. Silver has a characteristic high, sustained ring (like a small bell). Steel rings more briefly and dully. Brass is duller still.

At a Jeweller (accurate)

Touchstone test. The jeweller rubs the piece against a black stone (Lydian stone), leaving a streak. Acid is applied to the streak. The reaction reveals the fineness. An ancient method (used for thousands of years) but reliable.

X-ray fluorescence (XRF). A device directs X-rays at the piece and analyses the reflected spectrum. Determines composition to tenths of a percent. Does not damage the piece. Takes 30-60 seconds. Most jewellers and assay offices offer this service.

Fakes and How to Spot Them

Gold-Plated Brass Sold as Gold

The classic fraud. A brass ring coated with a thin layer of gold. Visually it looks like gold. By weight, it is lighter (brass is less dense than gold).

How to spot it. Weight test: a gold ring is noticeably heavier than an identical brass one. Acid test: a drop of nitric acid on an inconspicuous area - brass turns green, gold does not react. This test should be done by a jeweller, not at home.

Silver-Plated Copper Sold as Silver

A copper item coated with silver. Visually it looks like silver. Over time, the plating wears off, revealing the copper (a reddish metal beneath the silver surface).

How to spot it. If a scratched surface reveals a copper colour underneath, it is not silver. Silver beneath a scratch remains silver.

"Jewellery Steel" Sold as Silver

Stainless steel visually resembles silver. Some sellers pass off steel pieces as silver. The difference is in weight (steel is lighter than silver), sound (steel rings differently - a more "hollow" sound) and hallmark (steel does not carry a 925 mark).

Clarification. Stainless steel is an excellent material. There is nothing wrong with a steel piece of jewellery. What is wrong is selling steel at the price of silver. The per-gram cost of steel and silver differs by 5-10 times.

History of Hallmarking

How It All Began

The world's first compulsory hallmarking system was established in England in 1300. King Edward I decreed that all silver sold in London must pass inspection at Goldsmiths' Hall. The word "hallmark" itself - literally "mark from the Hall" - entered the English language from this practice.

Over 700 years, the system spread worldwide. Today, compulsory hallmarking operates in most EU countries, the UK, India, Japan and dozens of other nations. In the US and China, hallmarking is not compulsory - manufacturers mark items themselves and bear responsibility for accuracy.

The Goldsmiths' Company

The Worshipful Company of Goldsmiths has operated the London Assay Office since 1300. It is one of the Great Twelve livery companies of the City of London. The Goldsmiths' Company not only hallmarks precious metals but also conducts the Trial of the Pyx - the annual testing of British coinage, a ceremony dating back to the 12th century.

The Vienna Convention

In 1972, several European countries signed the Vienna Convention on the Control of the Fineness and the Hallmarking of Precious Metals. Signatory countries (including Austria, the UK, Sweden, Finland, Ireland, the Netherlands, Switzerland, Portugal, Czech Republic and others) recognise each other's hallmarks. A piece hallmarked in Vienna does not need re-hallmarking in London.

Hallmark and Allergy

Fineness affects allergenicity. The lower the gold fineness, the more alloying metals, and the higher the chance the alloy contains nickel.

585 yellow gold. Usually safe (alloy with copper and silver, no nickel).

585 white gold. Risky. Traditional white gold alloys contain nickel for the white colour. Modern versions use palladium instead, but not all. Ask.

375 gold. Higher risk. Lots of alloying metals = high probability of nickel.

925 silver. Usually safe. The alloy metal is copper, not nickel. But some manufacturers add small amounts of nickel.

316L stainless steel. Paradox: contains 10-14% nickel, but the nickel is bound in the crystal lattice and does not leach to the surface. Safe for most people with nickel allergies. But not all.

More detail - nickel allergy guide.

Hallmarks in Other Countries

France

One of the most elaborate systems. The French poincon system uses animal heads to indicate metal and purity. Eagle head = 18K gold (French manufacture). Owl = imported gold. Minerva head = silver. More in the French-specific article.

Italy

The stella (star) system: a five-pointed star followed by the province number and the maker's number. Italy's hallmarking system is among the most structured in Europe.

Germany

The Halbmond und Krone (crescent and crown) mark indicates German-manufactured gold. The fineness number accompanies it. Pforzheim has been the centre of the German jewellery industry since the 18th century.

Hallmark and Resale

If you ever want to sell a gold piece, the fineness determines the price.

Gold buyers. Buyers pay for the weight of pure gold in the piece, not the weight of the piece itself. A ring weighing 5 grams at 585 fineness = 5 x 0.585 = 2.925 grams of pure gold. The buyer pays for those 2.925 grams at the market price minus their margin (usually 10-20%).

The craftsmanship counts for nothing. However much the jeweller's work cost at purchase, at resale it is worth zero. The buyer purchases metal, not design.

Stones usually don't count. Cubic zirconia and crystals have no resale value. Natural diamonds do, but a buyer will value them significantly below retail price.

Conclusion. Jewellery is not an investment (unless it is antique or rare artisan work). Buy jewellery for pleasure, not for resale. If you want to invest in gold, buy bars or coins at 999 fineness.

Hallmark and Price: How to Calculate

The price of a precious metal piece consists of:

1. Metal cost at market price x weight x fineness. For example: gold costs X per gram. Ring weighs 5 grams. Fineness 585. Metal cost = X x 5 x 0.585.

2. Workmanship. Casting, polishing, stone setting, assembly. Usually 30-100% of the metal cost for mass production. 200-500% for artisan work.

3. Stones (if any). From pennies (CZ) to fortunes (natural diamonds).

4. Brand. The premium for a name. Tiffany sells a silver ring for the price at which an independent jeweller sells a gold one. You pay for the brand, consciously or not.

Practical tip. When buying gold by weight (common in Turkey, India, UAE), check: price per gram x weight x fineness = metal cost. Everything above that is workmanship and margin. If the margin exceeds 50% of the metal cost for a simple piece without stones, you are overpaying.

Exotic and Rare Metals

Palladium

Fineness 500 or 950. A platinum-group metal, cheaper than platinum but with similar properties: white, strong, hypoallergenic. Used as an alternative to white gold and platinum. Palladium hallmarking became compulsory in the UK in 2010.

Titanium

Not hallmarked (not a precious metal). But marked: "Ti," "Titanium," "Grade 1-5." Titanium is hypoallergenic, lightweight and incredibly strong. Drawback: cannot be soldered (a broken titanium ring cannot be repaired) and cannot be resized.

Tungsten Carbide

Marked "Tungsten" or "WC." Incredibly hard - virtually impossible to scratch. But brittle - can shatter from a strong impact (unlike steel, which bends). Tungsten rings cannot be resized. And cannot be cut with a standard ring cutter in an emergency - a special tool is needed.

What to Buy: Fineness vs Material

For daily wear without maintenance: 316L stainless steel. No hallmark, no tarnish, no allergy, no stress. Put it on, forget it.

For daily wear with minimal maintenance: 925 silver with rhodium plating. Beautiful, accessible, needs a wipe once a week and rhodium re-plating every year or two.

For special pieces (engagement ring, anniversary gift): 585 or 750 gold. Does not tarnish, does not peel, retains value.

For the ultimate: 950 platinum. If budget allows and you want "forever" without caveats.

What to avoid: 375 gold (little gold, lots of allergens), unhallmarked "gold" pieces from bazaars (unpredictable composition), "jewellery steel" at silver prices (overpaying for marketing).

FAQ

How can I check the hallmark at home? Reliably - you can't. Home tests (magnet, vinegar, iodine) give approximate results. The only reliable method is XRF analysis at an assay office or jeweller. Costs little, takes minutes.

Can a hallmark be fake? Yes. Fake hallmarks are struck on counterfeits. But the quality of a fake hallmark is usually lower: blurred outlines, wrong shield shape, misaligned symbols. Compare with photos of genuine hallmarks.

Why is there no hallmark on my piece? Possible reasons: the item is not precious metal (steel, brass, titanium are not hallmarked). Or it was made in a country without compulsory hallmarking. Or the hallmark wore off (happens on old pieces). Or the piece falls below the weight exemption threshold.

585 or 750 - which is better? Depends on your priority. 585 is harder and cheaper. 750 is more beautiful in colour and more prestigious. For everyday wear, 585 is more practical. For special pieces, 750 is justified.

Can you wear 925 silver every day? Yes, but it will tarnish. Clean every 1-2 weeks. Or plate with rhodium and clean less often. Or switch to stainless steel, which does not tarnish at all.

What is "medical gold"? A marketing term. Usually means 316L stainless steel with gold plating or PVD coating. Contains no gold in meaningful quantities. Not a medical product. The name was invented for sales, not accuracy.

What does "vermeil" mean? Silver 925 coated with a layer of gold. Called vermeil if the gold layer is at least 2.5 microns thick and at least 10K fineness. Combines the look of gold with the affordability of silver. More - how long does gold plating last.

What does "EP" or "GP" on jewellery mean? EP = Electroplated. GP = Gold Plated. Both mean the item is not solid metal but coated with a thin layer. This is not a hallmark. It is a coating designation. The base metal may be brass, copper or steel.

What does "GF" on jewellery mean? GF = Gold Filled. The gold layer constitutes at least 5% of the total weight. Significantly thicker than GP (gold plated). Gold Filled lasts years and decades. Common in American jewellery. Not widely seen in the UK but increasingly available online.

What does "Nickel Free" on jewellery mean? It means the item contains no nickel or contains it below the EU REACH regulation limit (less than 0.5 micrograms per square centimetre per week). Important for allergy sufferers. But "Nickel Free" is the manufacturer's claim, not a government guarantee. Trust but verify - especially if the allergy is severe. More - nickel allergy guide.

Is 9 carat (375) worth buying? If budget is limited and you specifically want gold, 375 is better than plating (375 won't peel). But if the choice is between 375 gold and quality stainless steel, the steel is more practical, more durable and won't cause allergic reactions. The gold content in 375 is less than 40%, which many countries don't consider high enough to call "gold" at all.

What's the difference between a hallmark and a trademark? A hallmark is an independent verification of metal content, applied by an assay office. A trademark (or brand mark) is the manufacturer's own mark. A hallmark tells you what the metal is. A trademark tells you who made it. Both may appear on the same piece, but they serve different purposes. Only the hallmark is legally enforced as a guarantee of composition.

Why does my Zevira jewellery have no hallmark? Because Zevira jewellery is made from 316L stainless steel, which is not a precious metal and does not require hallmarking. This is not a deficiency - it is a different category. Stainless steel's value lies in its practical qualities (strength, hypoallergenicity, no tarnishing), not in the metal's per-gram cost.

How to Verify a Hallmark: Step-by-Step

At Home

1. Take a jeweller's loupe or magnifying glass (10x magnification works best).
2. Look for marks on the inside of rings, on chain clasps, on earring posts, on bracelet clasps.
3. Note any symbols you see - the lion passant (silver), the crown (gold), any letters or numbers.
4. Compare what you find with the official hallmark guides published by the four UK assay offices (all available online).
5. If you cannot see any marks, the item may not be precious metal, may be exempt by weight, or the marks may have worn away.

At an Assay Office

Any of the four UK assay offices (London, Birmingham, Sheffield, Edinburgh) will test and hallmark jewellery for a fee. You can also have existing pieces verified. The process is straightforward: submit the piece, the office tests it and either confirms the existing hallmark or reveals the actual composition.

The Bottom Line

A hallmark is a jewellery passport. It tells the truth about composition when marketing may not. "Gold ring" could mean anything from 37.5% to 99.9% gold. "Ring hallmarked 750" is a specific composition, verified by an independent authority.

You do not need to be an expert gemmologist to understand hallmarks. The basics are enough: 925 = silver, 585 = 14K gold, 750 = 18K gold. Everything else is nuance, and now you know that too.

Three tiny marks on the inside of a ring are not decoration. They exist so you know what you are paying for. Read them. Understand them. And if they are absent, ask why. The answer to "why is there no hallmark" will tell you more about the seller than any advertisement.

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