Gold Assay
| Carat | Percent Gold | Hallmark |
| 24 | 100% gold | N/A |
| 22 | 92.2% gold | 922 |
| 18 | 75% gold | 750 |
| 14 | 58.5% gold | 585 |
| 9 | 37.5% gold | 375 |
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Assay Office Symbols
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London |
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Edinburgh |
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Birmingham |
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Sheffield |
Hallmarks are the authorised stamp impressions that
indicate maker, standard of fineness and the Assay office
where the Hallmark was issued. Older hallmarks also include the
year of manufacture, this is symbolised by a letter the font
of which changes with every cycle of the alphabet. They are
required by law if a piece of gold (9ct,14ct,18ct and 22ct)
or platinum weighs more than 1 gram , 7 grams for silver.
Any items requiring Hallmarking have to be sent to an Assay
Office, allow three to five weeks for this process. We have the facility to process urgent hallmarks in one week - extra charges apply, please contact customer services for more information. (01268 546546)
Points to note, if a previous repair has been undertaken by using an inferior metal e.g. silver instead of white gold, the item will fail the assay
New items which we supply will of course require hallmarking.
Points to note, if a previous repair has been undertaken by using an inferior metal e.g. silver instead of white gold, the item will fail the assay
New items which we supply will of course require hallmarking.
Gold Hallmark Example
Millesimal Fineness Mark - this is the number of parts per thousand of pure metal in the alloy. The current finenesses allowed in the UK are shown here.
Laser Hallmarks - these hallmarks are only burnt on to
the surface of the metal by a laser they can be very faint. Rings that have laser hallmarks
are harder to size as the hallmarks can easily be removed by the buffing and polishing that is necessary to size
a ring correctly. We suggest you bring this to the attention of your customer before sending to the workshop for alteration. If the
laser hallmark is removed it can be re-added for an approx. cost of £14.99. This will take a further 2-3 weeks as the ring will have to be sent to the Assay Office for remarking.