Archive for the ‘Hallmarks’ Category

Indian Gold Hallmarks

Unlike British hallmarking (which is mandatory for all items of gold jewellery weighing more than 1g), gold jewellery made in India does not have to be hallmarked or assayed. For the consumer, there is therefore no guarantee that an item purchased contains the correct quantity of gold, or in-fact, any gold at all!

If you have gold to sell, don’t forget to check out our up-to-date scrap gold prices.

Occasionally, we’ll receive an item bought in Asia in good faith, seemingly stamped as being gold, but being fake.

It is common to see Indian (and Asian) jewellery marked as ’22kt’, but when tested may only be between 87% to 88% pure, the equivalent of 21ct gold. This could be down to the quantity of solder used in intricate items (solder is often of a lower purity) or the jeweller simply using slightly less gold to increase their margin.

BIS Hallmark

A 22ct gold bangle with a BIS hallmark

To introduce more certainty within the Indian gold industry, the Bureau of Indian Standards introduced a voluntary BIS hallmarking scheme in 2000. For the consumer, an item of jewellery with the BIS mark can be relied on to contain the correct amount of gold.

Like a British hallmark, the BIS mark is made-up of a series of elements:

  • the official BIS logo
  • the purity / fineness of the item
  • the assaying & hallmarking centre’s mark
  • the date letter, indicating the year of marking
  • the jewellers identification mark

Indian Gold Hallmarks : The BIS logo

BIS Mark

Bureau of Indian Standards mark

This is the official BIS logo. Jewellers who want to use the BIS mark must obtain a licence and adhere to strict guidlines relating to the purity of marked items.

Purity / Fineness

The BIS recognise the following gold purities:

  • 375 : 9 carat
  • 585 : 14 carat
  • 750 : 18 carat
  • 875 : 21 carat
  • 916 : 22 carat
  • 958 : 23 carat

Assaying & Hallmarking Centre’s Mark

This mark identifies where the item of jewellery has been assayed and hallmarked.

Date Letter

The date letter shows the year the item was hallmarked. Starting in 2000 with the letter ‘A’ and moving up one letter each year, it is easy to work out the correct date. In our example photo above, the date letter ‘L’ tells us the bangle was assayed in 2011.

Jewellers Mark

This mark identifies the BIS certified jeweller / manufacturer of the item.

Related article: Bureau of Indian Standards hallmarking

October 20th, 2011 19 Comments » Hallmarks |

Simple Platinum Hallmark Guide

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.

The three compulsory platinum marks

Sponsor Mark

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.

Fineness Mark

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:

  • 850 (85% pure)
  • 900 (90% pure)
  • 950 (95% pure)
  • 999 (99.9% pure)

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.

Platinum fineness

Assay Office Mark

The assay office mark tells you which assay office tested and hallmarked your item. There are now four assay offices in the UK:

Assay Offices

Assay offices

 Optional platinum hallmarks

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.

Traditional Fineness Symbol

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.

Platinum fineness orb symbol


Date Letter

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.

Hallmark Date Letters

Standardised UK hallmark date letters from 1975 onwards

International Convention Mark

An International Convention Mark is sometimes shown within the hallmark. It is a mark recognised by all member countries of the International Hallmarking Convention.

Platinum convention mark

Convention mark

Testing platinum

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.

March 14th, 2011 23 Comments » Hallmarks, Platinum |

Simple Gold Hallmark Guide

Welcome to our simple gold hallmark guide. Since writing this article, we’ve now launched our free-to-use gold hallmark identification wizard, which will help you identify the purity and age of most UK hallmarked gold items.

Hallmarking (also called assay or standard marking) is the official quality control mark that determines the purity of gold and other precious metals.

To receive a price quotation using our scrap gold calculator, you’ll need to know the weight and type of gold you have. Fortunately, modern digital kitchen (or postage) scales are very accurate, allowing most customers to gain a relatively accurate indication of the weight of their gold. Identifying the type of gold can be a little more tricky, which of course requires us to read and decipher the hallmark stamped on the item.

For the purposes of explaining the various marks, we’ll use this ring.

22ct gold ring

The first mark we see is the makers mark, telling us who manufactured the item (in this instance, H Samuel).

The next mark we see is a Crown or Gold Standard Mark. This was first introduced in 1798 and can now been seen on all UK hallmarked gold that’s 9, 14 18 and 22ct. The crown also appears on old 12 and 15 carat gold, however this was stopped in 1932.

We now come to the mark that tells us the gold fineness (purity). First, let’s look at the shape stamp. You’ll notice it’s a rectangular shape with the corners shaved off. This again tells us the item is gold. An oval stamp would indicate the item is silver, a ‘house’ shaped mark is used for platinum items and three conjoined ovals denote palladium.

Millesimal Fineness Mark


The Hallmarking Act 1973 stipulates the use of the above symbols to identify the precious metal. This millesimal stamp number tells us the precious metal content.

It’s worth remembering that other countries have their own hallmarking standards, so the hallmark you see on your gold may well differ. Here is a table of common hallmark fineness stamps:

As our gold ring in the photo was made prior to 1973 (Hallmarking Act), the markings are slightly different, but still easy to understand. In our example, you can see the ’22’ stamp, indicating 22 carat gold.

The next mark tells us which assay office hallmarked the jewellery item. There are 4 assay offices in the UK:

  • Birmingham (Anchor symbol)
  • Sheffield (Rose)
  • London (Leopard)
  • Edinburgh (Castle)

As you can see, this ring was assayed in Birmingham.

The final stamp on our ring is the date stamp which tells us the year this item was tested and certified for fineness. Date identification is outside of the scope of this article, but in this instance, the shape of our letter ‘T’ tells us this ring was hallmarked in 1968.

As you can see, a hallmark can tell us a lot about the item. Providing you can identify the type of gold you have and its weight. you can use our gold calculator to work out the value of your item(s).

If you’d like to delve even deeper into hallmark identification, head on over to our gold hallmark identification wizard.

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January 4th, 2008 63 Comments » Hallmarks |