Frank G Bowen Limited

Auctioneers and Valuers since 1824

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Auction Sale Catalogue

First the items description given in the catalogue is only a guide, at auction it is up to the buyer to satisfy themselves, in the case of jewellery this is often whether an item is of precious metal or not.

Hallmarking is governed by the UK Hallmarking Act 1973 and amendments. Items must not be  sold in the U.K. as being wholly or partly made of gold, silver or platinum unless they are British hallmarked, exempt or have a Convention Mark (an agreement between certain countries recognising a hallmarking standard).

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However, some of our clients request that we sell all jewellery regardless of hallmarks as though they were base metal.

We therefore describe items as 'yellow metal' or 'white metal'. Gemstones are treated they same way, 'set red stones' or 'set white stones' for example. It is therefore up to the bidder to decide whether the item is precious or not.

A guide to hallmarks may be found in our sale rooms, but we have gathered together a guide for your assistance.

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British Hallmarks after 1998 consist of the following:

• A sponsor's or markers mark
• The number of parts per thousand of pure metal ie gold, silver, platinum
• An assay office mark, ie, London, Birmingham, Sheffield and Edinburgh
• and a date letter (optional)

Sponsors /

Makers Mark

... London

... Birmingham

... Sheffield

... Edinburgh

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1 ounce = 28.34952grams

1 Troy Ounce = 31.1035 grams     
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480 grains to 1 troy ounce

5760 grains to 1 troy pound

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The weight of a diamond is measured in Carats. 1 Carat equals 0.2 gram and there are 100 points to a carat