The Birmingham Assay Office informed the trade of changes to how the U.K. will enforce gold hallmarking with increases in ”bonded gold,” 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 percent gold alloy by weight on average, but could be easily mistaken as an all-gold item by the consumer or the retailer.
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.
The British Hallmarking Council (BHC) worked with Trading Standards authorities to find the correct way to mark bonded gold items based upon the existing provisions covering rolled gold and plated gold in the 1973 Hallmarking Act, according to the Assay Office.
The BHC’s view was that no enforcement action should be taken in respect of the use of the term “bonded gold.” The BHC further stipulated that, assuming the core is 925, 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 U.K. consumers. It is not permitted to mark the article 9K, 10K, 14K, 18K etc., as is common practice in the U.S. 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 & 18K bonded gold/rolled gold/gold plated.