Platinum hallmarking was introduced in the UK in 1975 as a result of legislation brought about by the Hallmarking Act of 1973. Prior to this date, items containing platinum would often carry no markings or simply ‘Plat’ or ‘Platinum’ and would be of varying purity.
A typical platinum hallmark
All platinum items weighing more than 0.5 grams must now carry a valid hallmark when sold in the UK. The photo on the right shows a typical hallmark. A platinum hallmark will consist of 3 compulsory and 3 optional stamps.
This post is a simple platinum hallmark guide, which we hope you find useful. If you have platinum to sell, please see our up-to-date scrap platinum prices. We also publish our scrap gold prices and our scrap silver prices.
Also referred to as the makers mark, the first stamp in the photo indicates who submitted the item for hallmarking. Each sponsor (maker) has their own unique stamp.
The third stamp in our example photo is the fineness mark. This tells you the precious metal content, expressed in parts per thousand. There are four recognised standards of platinum:
When identifying an item as being platinum, it’s important to check the shape and contents of the fineness mark. If the shape is anything other than what is shown below, it isn’t platinum. As you can see, our ring is 950 platinum.
The assay office mark tells you which assay office tested and hallmarked your item. There are now four assay offices in the UK:
The following 3 marks are all optional. Under hallmarking legislation, there is no compulsorary requirement to show these additional marks, however they are often shown.
If your platinum item has a purity of 950 or 999, it may display the traditional orb mark. In our example photograph, you can see the second stamp is the traditional fineness symbol.
Date letters are optional and therefore not always seen (as in our example photograph). The date letter tells us the year the item was hallmarked. As date letters were standardised across all assay offices from 1975, it’s quite easy to read. Below is a chart of all date letters from 1975 onwards.
Standardised UK hallmark date letters from 1975 onwards
An International Convention Mark is sometimes shown within the hallmark. It is a mark recognised by all member countries of the International Hallmarking Convention.
Without a valid hallmark, most jewellers and small scale gold buyers will not be able to accurately test the purity of platinum jewellery. Due to its inherent inertness, traditional ‘acid’ testing can only help determine if an item isn’t platinum, however you can’t for example differentiate 900 and 999 platinum.
High-end and specialist precious metal dealers use XRF (X-ray fluorescence) testing to accurately identify the platinum content of jewellery. Inductively coupled plasma, optical emission spectrometry is used by assay offices during the hallmarking process.
Platinum thermocouple wire
Used in laboratories and in scientific instruments, platinum thermocouple wire is often used for measuring temperatures in-excess of 2000°C.
Due to its high value, thermocouple wire should always be recycled. You can sell your platinum thermocouples to Gold-Traders and receive payment on the day we receive your package.
You can check our scrap platinum prices, which are always up-to-date. The rates we display are the prices we’re paying on that day. There are no hidden fees or deductions to be taken off the price.
If you’re unsure as to what type of thermocouple wire you have, we’ve compiled a short article to summarise the varieties of platinum thermocouples and the prices we pay.
To proceed, please fill out our claim form and follow our simple instructions in relation to postage and packing.
Unsure of the weight or type of gold you have? No problem! Simply complete our simple online claim form and send us your scrap gold for a free, no-obligation quote.
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