18ct Gold Rings

Rings in 18ct gold — 75% pure gold — the premium British hallmarking standard for fine jewellery across every era from Georgian to the present day. The 18ct standard was added to the legal hallmarking system in 1798 alongside the existing 22ct, and it has remained the dominant purity for engagement rings, dress rings, and high-quality gemstone settings ever since. This is the largest purity-specific gold collection, drawing from Georgian, Victorian, Edwardian, and Art Deco stock.

At 75% gold content, 18ct offers the best combination of colour and durability for ring wear. It is actually harder than 9ct on the Vickers scale (135–165 HV versus 80–120 HV) while being significantly more tarnish-resistant — the lower alloy content means less susceptibility to chlorine, bleach, and sulphur. The colour is a deep, saturated yellow that distinguishes it immediately from lower purities. Georgian and Victorian 18ct rings display the warm, slightly orange-toned yellow characteristic of copper-rich alloys, while Edwardian and Art Deco pieces sometimes combine 18ct gold shanks with platinum heads.

British hallmarks show a crown (pre-1975) or the "750" millesimal fineness stamp alongside assay office and date letter marks. The crown-plus-18 stamp on Victorian and earlier pieces is one of the most recognised hallmarks in the British system. For a full guide to gold purities and hallmarks, see our article on gold in antique jewellery.