{"id":23727,"date":"2025-11-11T11:57:04","date_gmt":"2025-11-11T11:57:04","guid":{"rendered":"https:\/\/www.serendipitydiamonds.com\/blog\/?p=23727"},"modified":"2025-11-14T08:50:55","modified_gmt":"2025-11-14T08:50:55","slug":"what-does-a-585-gold-stamp-mean-on-jewellery-popular-hallmarks-explained","status":"publish","type":"post","link":"https:\/\/www.serendipitydiamonds.com\/blog\/what-does-a-585-gold-stamp-mean-on-jewellery-popular-hallmarks-explained\/","title":{"rendered":"The 585 Gold Stamp – What Does it Mean for Gold Jewellery"},"content":{"rendered":"\n

An item of jewellery stamped with the number 585 usually indicates that the piece is made from 14-carat Gold. But what is the significance of the number 585? These digits represent 58.5% gold content within an item of jewellery\u2014consistent with all 14-carat Gold. Similarly, 18-carat gold which contains 75% gold<\/a>, features a 750 stamp visible within most jewellery made from this fineness of Gold. <\/p>\n\n\n\n

Besides the 58.5% gold content, 14-carat gold also contains additional metals, such as Silver, Copper, Zinc and Palladium. The additional 41.5% of alloyed metals help adjust the colour, improve casting, and alter the malleability and durability of the Gold. <\/p>\n\n\n\n

How trustworthy is the 585 Gold stamp?<\/h2>\n\n\n\n

Within the UK, most items of jewellery feature the 585 stamp within a legitimate and official Hallmark from one of several Assay Offices in Britain. On its own, a 585 stamp cannot be trusted unless the metal’s fineness has been independently tested. For this reason, we send most of our pre-loved jewellery designs<\/a> to the Assay Office if they do not feature a detailed hallmark. <\/p>\n\n\n\n

\"14ct<\/figure>\n\n\n\n

Additional markings, including the 14K Stamp.<\/h2>\n\n\n\n

Some items of jewellery of this purity might feature additional markings. For example, 14K often appears within items made from 14-carat Gold. <\/p>\n\n\n\n

14-carat Gold vs 18-carat and 9-carat Gold. <\/h2>\n\n\n\n

At Serendipity Diamonds, we are often asked which metal is best for jewellery. As a rule, we sell 9-carat Gold and 18-carat Gold as our two most popular alloys. 9-carat Gold tends to offer a harder less malleable metal, less expensive than the other purities. However, 18-carat tends to be more durable over time and less prone to tarnishing due to a higher Gold content. In contrast, 14-carat Gold falls between the two. <\/p>\n\n\n\n

How heavy is 14ct Gold compared to 9ct Gold?<\/h2>\n\n\n\n

14-carat Gold is approximately 1.18 x heavier than 9-carat Gold. The difference can be seen in a precious metal weight conversion<\/a> chart showing each alloy. <\/p>\n\n\n\n