18ct Gold Price

Our 18ct gold price estimate uses current market pricing, the weight you enter and the purity of your gold. It provides a starting point for understanding value, while the final offer depends on the buyer’s assessment.

You can also check gold prices through the Sell My Gold app. Download it for your Apple device or Android device to explore your options.

Understand the 18ct gold price before selling

If you have unwanted jewellery, checking its estimated value can help you decide what to do next. Start with our Gold Price Calculator, which uses your weight and purity details to estimate the gold’s value.

For example, you might want to value an old wedding band, a damaged bracelet or a necklace you no longer wear. Each item deserves a clear assessment. Therefore, gather the details you know before entering figures into the calculator.

An estimate can help you prepare questions and compare offers. However, it cannot confirm the purity of an item or establish its exact gold weight remotely. Treat the result as useful guidance before a physical assessment.

What does 18ct gold contain?

18ct gold contains 75% gold, with other metals making up the remaining 25%. The UK fineness mark 750 represents this proportion: 750 parts gold per thousand. You can check this standard in the Birmingham Assay Office’s gold hallmarking guide.

First, look for marks inside rings, on pendant backs or near necklace clasps. A readable 750 mark helps you identify the likely purity. However, if a mark looks unclear, ask a professional to interpret it rather than choosing a carat by appearance alone.

Also, separate jewellery with different purity marks. For instance, a 9ct chain and an 18ct ring need different rates in your calculation. Keeping them apart helps you avoid applying the wrong price to the combined weight.

Using our 18ct gold price calculator

Enter the estimated weight of your gold in grams and select 18ct as the purity. Then, review the result and check that you entered the correct figures. A small typing error can make a substantial difference to an estimate.

1. Identify the items: list the jewellery or other pieces you want to value.
2. Check the purity: use readable marks or information from a professional assessment.
3. Enter the weight: use grams and calculate different carats separately.
4. Review the estimate: note the date, weight and rate before comparing offers.

If you return to the calculator later, use the same details for a meaningful comparison. Otherwise, a different weight or purity selection could explain the change in value. You can also keep a screenshot of the result for reference.

How to calculate the value per gram

For a straightforward estimate, multiply the eligible gold alloy weight by the quoted 18ct gold price per gram. Make sure the rate applies specifically to 18ct material.

Estimated value = gold alloy weight in grams × quoted 18ct rate per gram

For example, a hypothetical rate of £50 per gram would give a value of £600 for 12 grams of 18ct gold alloy. This example explains the calculation only; it does not represent today’s rate or a guaranteed payment.

Because an 18ct rate already accounts for purity, do not multiply the result by 75% again. Doing so would apply the same adjustment twice and understate the estimate. Similarly, do not treat a pure-gold benchmark as a buyer’s quoted rate for your jewellery.

Check the weight of stones and other components

A piece of jewellery can contain more than gold alloy. Stones, non-gold fittings and other components contribute to its total weight. However, a buyer should not automatically value those components at the same rate as the gold.

For example, a stone-set ring needs a different weight assessment from a plain band. Likewise, a watch may contain a movement and several non-gold parts. Ask the buyer which weight they use when calculating the offer.

Home scales can give you a rough starting point, but they may not measure small pieces accurately. Therefore, compare your estimate with the buyer’s recorded weight and ask about any difference. Avoid dismantling jewellery or removing stones simply to obtain a measurement.

How professionals assess gold purity

Purity testing helps a buyer decide whether the 18ct gold price applies to your item. The assessor can examine its marks and choose an appropriate test. If the result differs from your expectation, ask for an explanation before accepting the valuation.

One assessment method is X-ray fluorescence, or XRF testing. This technology helps professionals identify and measure elements in precious-metal alloys. However, equipment, calibration and sample positioning affect performance, so proper interpretation matters. Thermo Fisher Scientific explains these differences in XRF testing.

Before testing begins, ask what the assessment involves and whether any procedure could leave a mark. This is especially useful when you want to preserve a piece’s appearance or have not yet decided whether to sell.

Compare the 18ct gold price and the final payment

When you compare buyers, look beyond the headline rate. First, check whether each figure represents an estimated metal value or an expected payment. Then, confirm that the buyers use the same purity and weight.

Also, ask about fees or deductions and how long an offer remains available. A clear explanation makes it easier to understand the amount you would receive. Keep the answers alongside your calculator estimate so you can review them together.

• What rate per gram applies to your items?
• What weight does the buyer include in the calculation?
• Will any fees or deductions reduce the payment?
• When would payment take place after acceptance?
• What happens if you decline the offer?

For a postal sale, review the tracking, insurance and return arrangements as well. These details help you assess the whole service, alongside the price.

Can broken 18ct jewellery still have value?

Broken jewellery can still contain valuable gold. For example, a snapped chain, an odd earring or a damaged clasp does not remove the gold content from the rest of the piece. Explore our guide to jewellery, coins and other gold items you can sell for more information.

However, a calculator estimates metal value rather than every possible source of value. If you think an item has antique, designer or collectable interest, consider a specialist valuation before choosing a selling route. This gives you another way to assess your options.

Review your options before selling

The current 18ct gold price is a useful starting point, but your decision should also reflect the offer and your reasons for selling. Take time to review the figures and set aside any pieces you would prefer to keep.

When you are ready, complete our gold selling form to begin. Alternatively, contact us if you have questions about the assessment or selling process.