Platinum price per gram in pounds
Platinum jewellery in Britain is hallmarked at one of four standards set by UK hallmarking law: 850, 900, 950 or 999 thousandths. This calculator reads the spot price of a troy ounce of platinum in pounds from gold-api.com, shows when it was set, and gives the value per gram at each standard and the metal value of a piece of the weight you type. Platinum wedding bands and engagement rings are dense and heavy for their size, so a plain band can hold several grams. Platinum has at times been dearer than gold and at times much cheaper; the calculator always uses the price of the moment rather than any assumption about which is worth more. Platinum items under 0.5 g are exempt from hallmarking. Gold by Carat is an independent site, not a platinum buyer or a dealer, and quotes no buying prices.
Example: 5 g of platinum 950
£180.81
Value of the metal itself at today’s price
| 1 g at 850 | £32.36 |
| 1 g at 900 | £34.26 |
| 1 g at 950 | £36.16 |
| 1 g at 999 | £38.03 |
| 1 troy oz, fine | £1,184 |
Figures and rules checked by the site’s publisher, Radif Partners · How the values are worked out · Editorial policy
Platinum price per gram, by standard and weight
| Standard | Per gram | 5 g | 10 g |
|---|---|---|---|
| 850 | £32.36 | £161.78 | £323.56 |
| 900 | £34.26 | £171.29 | £342.59 |
| 950 | £36.16 | £180.81 | £361.62 |
| 999 | £38.03 | £190.14 | £380.27 |
For comparison, when this page was built (9 November 2026, 11:53 pm UK time), a troy ounce of gold was £3,099 and a troy ounce of platinum £1,184; the calculator above gives the platinum price of the moment.
More detail below: tap a heading to open it.
The legal standards
UK hallmarking law sets four standards for platinum: 850, 900, 950, 999. Platinum articles weighing less than 0.5 g are exempt under the hallmarking law, half the limit for gold.
Telling white metals apart
White gold, platinum and palladium look alike. White gold is gold alloyed with white metals and often rhodium-plated; its hallmark is a gold standard such as 375, 585 or 750. Platinum carries 850 to 999 with a platinum assay mark, palladium 500, 950 or 999. Platinum is noticeably heavier than the others for the same size. If a ring has no mark, a buyer will test it. The hallmark guide shows each mark, and the palladium page and 18ct page value the alternatives.
Check an offer for this gold
Example: this offer pays
69.6%
of the £186.79 the gold is worth in this example of 5 g of 9ct
Is it a good offer? No law or official body publishes what buyers pay, so nobody can tell you a normal percentage. Your yardstick is other quotes: ask one or two other buyers about the same gold today, and if one pays clearly less than the others, walk away. 100% would be all the gold is worth. Every 10 percentage points on this gold is £18.68.
Got two or three quotes? Compare them side by side →
| Value of the gold | £186.79 |
| Offer | £130.00 |
| Difference kept by the buyer | £56.79 |
| Offer per gram | £26.00 |
What the buyer keeps pays for melting and refining, staff and the risk that the price falls: it is not all profit.
Before you say yes
- Ask for the weight and the carat the buyer wrote down, and compare them with yours.
- Get one or two more quotes for the same gold today: the highest share is the best offer.
- A signed, antique or stone-set piece may be worth more to a second-hand jeweller than its gold.
The offer checker above works for gold; for a platinum quote, compare the per-gram offer with the per-gram value in the table.