18ct gold price per gram today
18ct gold is hallmarked 750: three quarters pure gold. Here's what a gram of it is worth in metal today, with a calculator and an offer checker.
18ct gold, UK
Loading today's price…
18ct gold value by weight
| Weight | Metal value |
|---|---|
| 1 g | … |
| 2 g | … |
| 5 g | … |
| 10 g | … |
| 20 g | … |
| 50 g | … |
| 100 g | … |
| 1 troy ounce (31.1 g) | … |
What 18ct means
Carats count gold in 24ths, and the UK hallmark shows it in parts per thousand. 18ct gold is hallmarked 750, which means at least 750 parts in every 1,000 are pure gold. The rest is other metals that make it harder and change its colour.
A UK hallmark has three compulsory marks: the sponsor's (maker's) mark, the fineness mark such as 750, and the mark of the assay office that tested it. Hallmarks explained
The figures here are the value of the pure metal at today's spot price. Anyone who buys your gold has to melt and refine it and make a margin, so their offer will be below this. Offers vary between buyers, which is why it's worth getting more than one quote and comparing them with the offer checker.
Other carats
Common questions
How much is 18ct gold worth per gram today?
The live figure is at the top of this page, updated every 4 hours. It is 75% of the price of pure gold, because 18ct gold is hallmarked 750.
How do I know if my gold is 18ct?
Look for the hallmark. UK 18ct gold carries the fineness number 750, alongside the maker's (sponsor's) mark and an assay office mark.
Why do buyers pay less than the 18ct price shown?
The price shown is the value of the gold in the item. Buyers refine the metal and keep a margin, so offers are lower. Use the offer checker to compare quotes.
Sources
- UK Assay Offices: Hallmarking Guidance Notes (November 2022)
- Assay Office London: What is a hallmark?
- Weights and Measures Act 1985, Schedule 1 (legislation.gov.uk)
- MetalCharts: live metal prices
- Frankfurter: exchange rates
Last reviewed October 2026. Spotted a mistake? Email hello@goldpergram.co.uk. How we calculate