Ever increasing gold prices are driving significant changes in the UK fine jewellery trade, one such
trend being the introduction of ‘bonded gold’ and an increase in gold plated and rolled gold
products coming to market. ‘Bonded gold’ items are produced with a thick layer of gold alloy
‘bonded’ on to a base metal or sterling silver core. The resulting article is only about 10% gold
alloy by weight on average, but could be easily mistaken as an all-gold item by the consumer or
Such products have been introduced from the United States where there are clear regulations for
marking and describing them. However, the descriptor ‘bonded gold’ is not specifically permitted
by the 1973 Hallmarking Act, which did not envisage the development of the process at the time it
was drafted. Advice has been sought from the British Hallmarking Council (BHC) by Trading
Standards Authorities about the use of the term “bonded gold” and as to the correct way to mark
such items. Official guidance has now been issued, based on the existing provisions covering rolled
gold and plated gold in the 1973 Hallmarking Act.
The BHC’s view is that no enforcement action should be taken in respect of the use of the term
‘bonded gold’. The BHC further stipulates that, assuming the core is 925 ie Sterling Silver, the
article should carry a full silver hallmark, or a 925 stamp if it is under the Hallmarking exemption
weight for silver of 7.78 grams. Bonded Gold on a base metal core cannot be hallmarked.
No stand-alone gold fineness marks will be permitted on bonded gold articles, because
they are potentially confusing and misleading to UK consumers. It is not permitted
additionally to mark the article 9k, 10k, 14k, 18k etc, as is common practice in the United States.
The only circumstance in which this is allowed is if the gold fineness is immediately preceded or
followed by the words ‘bonded gold’, ‘rolled gold’ or ‘gold plated’. For example, an article with
a silver hallmark (or 925 stamp on underweight articles) can be marked as follows ‘925 & 18ct
bonded gold/rolled gold/gold plated’.
It is also emphasised that the bonded gold layer must be of a fineness of at least 375 parts per
thousand and of a recognised in UK standard. So, for example, ‘bonded gold’ of apparently 10K
can only be described as 9 carat. This follows the practice for gold plated and rolled gold articles
in the UK.
The guidance applies to all bonded gold, rolled gold and gold plated silver articles below the 7.78
gram exemption weight for hallmarking, as well as for those requiring hallmarking. The exemption
is an exemption from hallmarking itself, not from the requirements of every other part of the
Hallmarking Act 1973.
Mr Christopher Jewitt, newly appointed Chairman of the BHC says “Some of the bonded gold items
we have seen had very confusing markings and the consumer could easily have believed them to
be 9ct gold throughout. The British Hallmarking Council supports trading standards and the assay
offices in implementing and enforcing this important guidance to ensure that UK jewellers and
consumers are protected from being misled.”
The full guidance from the British Hallmarking Council can be found at on any of the 4 UK assay offices’ websites. For more information contact Geraldine Swanton, Secretary, British Hallmarking Council, or ask your assay office.
British Hallmarking Council Secretariat
Geraldine Swanton (Secretary)
British Hallmarking Council
No 1 Colmore Square
Tel: 0870 763 1455
Fax: 0870 763 1855