What 18ct gold means
18ct is an alloy of 18 parts pure gold to 6 parts other metals, equal to 75% pure gold. It is common in higher-end jewellery, engagement rings and watches.
18ct gold per gram
18ct Gold Price Per Gram UK
18ct gold contains 75% pure gold. Use the calculator to estimate the per-gram value of 18 carat rings, chains and jewellery using live UK gold price data.
Gold value calculator
18ct gold value calculator
Enter a weight to see your estimated gold value.
This estimate is for guidance only and is not a guaranteed buy price. Final offers depend on testing, purity, item weight, condition, stones, non-gold parts, buyer margin and market movement.
This is an estimate, not a guaranteed offer. Final buyer offers depend on live market conditions, purity testing, weight, item condition, authenticity and the buyer's commercial margin.
Live gold price reference
Prices are market references only and are not guaranteed buy prices.
Gold price per gram (24ct)…
Gold price per troy ounce…
9ct gold price per gram…
14ct gold price per gram…
18ct gold price per gram…
22ct gold price per gram…
24ct gold price per gram…
Estimating value per gram
Take the weight in grams and multiply by today's 18ct gold price per gram to get a rough market metal value before buyer margin.
When 18ct value matters most
Heavier 18ct items like solid bracelets, watch cases and wedding bands can carry significant metal value — always weigh before requesting a quote.
FAQs
How is the 18ct gold price per gram calculated?+
Multiply the live 24ct gold price per gram by 0.75 — 18ct gold contains 75% pure gold.
Is 18ct gold worth twice as much as 9ct?+
By pure metal content yes — 18ct contains 75% gold vs 37.5% in 9ct — so per-gram metal value is roughly double.
What hallmark confirms 18ct gold?+
Look for '750' on UK jewellery; it indicates 75% pure gold.
Where to sell after checking your gold value
Once you have a guide value, you can compare trusted gold-buying options. For postal gold packs backed by a real high street headquarters, visit HighStreetGold. For face-to-face gold valuations in St Helens, visit St Helens Gold. For upcoming face-to-face valuations in Birkenhead and Wirral, visit Birkenhead Gold.
HighStreetGold
Best for: Postal gold packs
Request a postal gold pack and send your items to HighStreetGold headquarters for a clear valuation before deciding whether to sell.
Sell Gold by PostSt Helens Gold
Best for: Face-to-face gold valuations in St Helens
Visit St Helens Gold inside Cash Generator St Helens for a local in-person gold valuation.
Sell Gold in St HelensBirkenhead Gold
Best for: Upcoming Wirral and Birkenhead gold-buying location
Birkenhead Gold is an upcoming local gold-buying location for Birkenhead, Wirral and surrounding areas.
Visit Birkenhead GoldGold Pricer may link to selected gold-buying services connected to our wider network. Always check the buyer’s terms, valuation process and offer before selling.