A promise ring can cost anything from a few pounds to several thousand. That sounds unhelpful, so here is the useful version: there is no expected budget, and the price is driven almost entirely by two things — whether the metal is solid or plated, and whether there is a real certified stone in it.

This guide sets out realistic price bands, explains what you get at each level, says plainly what we would avoid, and covers where to buy one for a girlfriend or partner without ending up with something that falls apart.

Is there a rule about how much to spend on a promise ring?

You will find articles quoting figures — a month’s salary, a set percentage of income, a specific pound amount. None of these is a measured fact. The salary rules are marketing conventions attached to engagement rings, and they have never applied to promise rings at all.

The only sensible budget is what you can pay for comfortably without borrowing. A promise ring that arrives with a credit card balance behind it starts the whole thing badly.

What are realistic promise ring price bands in the UK?

The following is guidance based on what these rings generally cost in the UK market, not a survey. Where diamonds are mentioned, these figures are for lab-grown stones; the equivalent rings set with mined diamonds cost noticeably more for the same size and quality.

Budget	What you can realistically buy	The catch
Under £50	Plated base metal, imitation stones	The plating wears through within months of daily wear
£50–£200	Sterling silver, small real stones or simple bands	Silver is soft, scratches and needs regular polishing
£200–£500	Slim solid gold bands; silver with certified small diamonds	Check it is solid gold, not gold-filled or vermeil
£500–£1,000	Solid gold or platinum, hand-made, with a certified lab-grown diamond	Little to catch here — this is where value peaks
£1,000+	Larger stones, eternity bands, more complex settings	You are moving into engagement ring territory in looks as well as price

What do our own promise-ring-suitable pieces cost?

For a sense of real numbers rather than ranges, three from our range, all hand-made in solid metal with certified lab-grown diamonds, prices correct at the time of writing:

• Stackable pear cut ring — £503. A slim band with pear-shaped stones; the least expensive stone-set design we make.
• Minimalist round cut solitaire — £587. One modest round diamond in a clean setting.
• Minimalist round cut wedding band — £687. A plain, unisex band that works for either partner.

Below that, our stackable rose cut band in sterling silver is £489 and is the entry point into hand-made rather than mass-produced.

Why is the cheap end a false economy?

Rings under about £50 are almost always plated: a microscopically thin layer of gold over brass or steel. They look correct in a photograph and on day one. Worn daily, the plating wears through at the back of the band first, then across the top, exposing a different-coloured metal underneath. There is no repair; the ring is simply finished.

The same applies to imitation stones, which scratch and cloud. Cubic zirconia in particular goes dull within a year or two of constant wear, at which point the ring looks tired rather than loved.

If your budget genuinely is under £100, a small solid sterling silver band with no stone will outlast anything plated at the same price and will still look like real jewellery in five years.

What do lab-grown diamonds do to the budget?

This is the single biggest change in this price range in the last decade. A lab-grown diamond is a diamond — the same carbon crystal, the same hardness, graded on the same scale by the same laboratories. It costs substantially less than a mined stone of equivalent size and quality.

The practical effect is that a few hundred pounds now buys a genuine certified diamond in solid gold, where the same money would once have bought an imitation stone in plated metal. Every centre stone we sell comes with a free IGI certificate, so what you are paying for is documented independently.

Where should you buy a promise ring for your girlfriend?

Wherever you buy, the questions are the same. Run through these before ordering:

1. Is the metal solid and hallmarked? UK hallmarks stamp the purity inside the band — 925 for sterling silver, 375 for 9ct gold, 585 for 14ct, 750 for 18ct, 950 for platinum. “Gold tone”, “gold filled” and “vermeil” are not solid gold.
2. Is the stone certified, and by whom? An independent laboratory report means someone with no stake in the sale graded it.
3. What is the returns window? Sizing is the most common problem. Ours is 30 days, and delivery within the UK is free and insured.
4. Can it be resized? Gold, silver and platinum can. Titanium and tungsten generally cannot.
5. Who made it, and can you talk to them? If something needs adjusting later, a maker you can reach is worth a great deal.

Marketplace listings at very low prices are usually plated, usually unhallmarked, and usually impossible to get repaired. That is the main thing to steer around.

How do you choose her ring without asking?

Two things go wrong most often. The first is metal colour — look at what she already wears rather than at what looks best in the product photograph. The second is size, and the reliable method is borrowing a ring she already wears and having it measured rather than guessing from a photo.

On style, keep it smaller and simpler than an engagement ring unless you want it read as one. Stacking bands and slim solitaires are the two designs that consistently work.

What actually drives the price of a ring?

If you want to understand why two rings that look similar are £200 apart, these are the four levers.

Weight of metal. Precious metal is sold by weight, so a wider or deeper band costs more before anything else is added. This is also why a very cheap “gold” ring is usually hollow or plated — there is no other way to hit the price.

Carat and purity. 9ct gold contains 37.5% gold, 18ct contains 75%. That difference shows up directly in the price, and it is also why 9ct looks paler.

The stone. Carat weight matters most, but colour, clarity and cut grade all move the price. At promise ring sizes, the top clarity grades add cost without adding anything you can see, because tiny inclusions are invisible below about 0.30ct without magnification.

The making. A hand-made ring costs more than a cast one produced in volume, and it is generally better finished, with tighter settings and cleaner edges. It is also repairable by the people who made it.

What does a promise ring cost to look after later?

Two ongoing costs are worth knowing about before you choose, because they are rarely mentioned at the point of sale.

White gold is usually finished with rhodium plating to make it bright white. That plating wears through with daily wear and needs redoing, typically every two to four years. It is inexpensive but it is a recurring job. Platinum, being naturally white, never needs it.

Resizing is the other one. Fingers change size over the years, and a ring that fits at twenty-two may not at thirty. Plain bands are cheap to resize; full eternity bands set with stones all the way round often cannot be resized at all, which is worth knowing before you buy one as a promise ring.

Where is the money best spent?

Our honest order of priority, if the budget is tight: fit first, then solid metal, then the stone. A well-fitting solid gold band with a small certified diamond will be worn for decades. A larger stone in a thin, hollow band will bend, and correcting that costs more than the difference you saved.

Frequently asked questions

How much should a promise ring cost compared with an engagement ring?

Almost always less, and usually much less. That difference is part of how the ring is understood.

Is it acceptable to spend very little?

Yes. What matters is that the ring is well made for its price, not that the price is high.

Do promise rings hold their value?

Treat any ring as something you buy to wear rather than as an investment. Resale values for jewellery of all kinds are far below retail.

Is a lab-grown diamond worth less than a mined one?

It costs less to buy, and it is the same material with the same hardness and the same grading. If you want the biggest, best-quality real diamond your budget allows, lab-grown is the direct answer.

What if I want something you do not stock?

We design bespoke pieces at no extra design cost, hand-made in solid gold and platinum in North Harrow, London, so you pay for materials and work rather than for the design.

To compare real prices rather than ranges, browse our stone-set ring collection or the band and eternity ring collection. Everything includes free insured UK delivery, 30-day returns, and a free IGI certificate on centre stones.