Frank G Bowen Limited
Auctioneers and Valuers since 1824
Auction Sale Catalogue
|Home Page||Jewellery||Catalogue||Private Treaty||Auction Sale guide.|
|One of the most commonly asked
questions at our sales, and one which causes the most confusion concerns how
jewellery and watches are described in our catalogue for example, why a lot
is described as 'A yellow metal ring' when the item in question is hallmarked.
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).
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.
British Hallmarks after 1998 consist of the following:
|Purity mark||.||.||Assay Office Mark|
|The table below shows the
new and old systems of defining precious metals.
1 ounce = 28.34952grams
1 Troy Ounce = 31.1035 grams
480 grains to 1 troy ounce
5760 grains to 1 troy pound
The weight of a diamond is measured in Carats. 1 Carat equals 0.2 gram and there are 100 points to a carat
|Gold||333||8 carat||German Min|
|Gold||9 carat||UK Standard|
|Gold||417||10 carat||USA min|
|Gold||620||14.8 carat||Dental Gold|
|Gold||800||19.2 carat||Portuguese Standard|
|Gold||875||21 carat||Arabic countries|
|Gold||22 carat||Indian Subcontinent|
|Gold||Two Nines (min)|
|.||.||.||.||Frank G Bowen Limited|