Platinum Calculator UK

How Do I Calculate the Value of My Platinum?

Platinum is one of the rarest precious metals — about 30 times rarer than gold. Calculating its value follows the same principle as gold and silver: weight × purity × spot price per gram.

1. Weigh your item in grams. Platinum is dense (21.45 g/cm³), so even small pieces can be surprisingly heavy. A standard platinum wedding band weighs 6–10 g.
2. Check the hallmark. UK platinum jewellery is almost always 950 (95% pure). Bullion is 999 (99.9%).
3. Multiply: For example, an 8 g wedding band at 950 purity: 8 × 0.95 × £47.69 = £362.44 spot value.

What Purity Is My Platinum?

Unlike gold, which comes in many carats, platinum jewellery in the UK is almost exclusively 950 purity (95% platinum, 5% alloy — usually ruthenium or cobalt for hardness).

In the UK, any item described as “platinum” must be at least 850 parts per thousand (85%) and must carry an assay office hallmark if it weighs more than 0.5 grams.

How Much Is a Platinum Ring Worth?

A typical platinum engagement or wedding ring weighs between 4 and 10 grams. Here are some worked examples at today's prices:

Dealer offers for platinum jewellery typically range from 70–75% of spot value. Coins and bars attract higher offers (80–90%). Get multiple quotes from our dealer directory to maximise your return.

Does Platinum in a Catalytic Converter Have Value?

Yes — automotive catalytic converters contain platinum group metals (PGMs) including platinum, palladium, and rhodium. A typical catalytic converter contains 3–7 grams of PGMs.

Important legal note: Under the Scrap Metal Dealers Act 2013, it is illegal in England and Wales to buy or sell catalytic converters removed from vehicles unless you hold a scrap metal dealer's licence. Catalytic converter theft carries severe penalties. Only sell through licensed motor salvage operators or vehicle dismantlers.

If you have a legitimately obtained catalytic converter (e.g. from your own end-of-life vehicle), a licensed scrap dealer can test and value the PGM content.