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Hallmarking Services Provided by Assay Office London Traditional, Struck Marks The traditional method of marking is using a punch. In this method, the mark is created by moving (forming) the metal. The size of the hallmark is thus dictated by the sizes of the punches used. If no indication is placed on the hallnote, then a normal UK mark is applied. A minimum mark can also be requested and is charged at the same rate.  Laser Hallmarking During laser hallmarking, a very fine laser beam of high power is used to melt and vaporise material thus allowing creation of a detailed mark. Unlike the traditional method, laser hallmarking is akin to etching where material is removed. Benefits Because laser hallmarking is an etching process and metal is not moved, laser hallmarked articles do not suffer bruising and do not require any setting back. The process is thus ideal for hallmarking hollow or thin articles and when minimum finishing is required. Unlike traditional hallmarks where surface detail can be polished away, 3D laser hallmarks (see below) retain excellent definition when polished heavily. A laser also permits marking of logos, signatures and serial numbers etc. Goods Suitable for Laser Hallmarking The limited depth of focus on a laser makes flat articles, such as watch backs, photo frames, tops of cufflinks and flat areas on large wares, the best suited for laser hallmarking. Marking on curved articles is possible when the radius of curvature is sufficiently shallow to maintain focus (a smaller size/length mark often helps for these articles). Large bangles and bracelets can usually be marked but rings and other articles, which have a tight radius of curvature, can be difficult or impossible.
This is the premium quality laser hallmark. It resembles a struck mark and is available in sizes A (6mm) to G (2mm). Requirements for smaller marks will be considered.
This resembles the outline of a struck hallmark and is available in sizes A (6mm) to M (0.5mm). Mark Formations
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