|Black diamante vintage necklace 1960s of age.|
If your costume jewellery is damaged ie - stones missing, clasp broken, links broken, etc. This will devalue your piece considerably. It may only be of use to use as repair or spares. Then sell it with any other broken jewellery on Ebay or give to a crafter friend.
So now you have confirmed that you have costume jewellery or otherwise. You may have found a makers mark. So again do your research and look up about the maker, then look at a range of similar jewellery to find an average value. You may be able to find the actual piece you have, which will make it much easier to value.
|Amber glass vintage costume bracelet by Sphinx|
If your wanted to sell to a jewellery dealer - then you will not get anywhere near this resale amount. Dealers will deduct 2/3rds or more of the price they want to buy it at. This will give them enough profit to make it worth their while. Because they have to build in costs of their shop's property/rates/ website costs/promotions and not forgetting staff wages. If you are selling online then they will need to consider the postage costs and also the packaging. Selling a single item is more costly that many pieces because of the time facture of getting this piece ready for sale - cleaning and then listing. so do not be suprised if the dealer's offer is very low.
No markings on your costume jewellery - then look at the age of your piece. Make an estimate at what you know of its age. Then do a search of jewellery from that decade. Does your piece fit in with the style of that decade? If not try a decade before or after - continue until you find an estimate on how old your costume jewellery is. From this it will be easier to make a search of the similar pieces of that era for an estimate of value.
As with all antiques and collectibles they can go up and down in value depending on the fashion. It may be advisable that you just keep your jewellery safe for a few more years - until it either comes back in fashion or the price increases.
|Yellow and white bone china brooch|
If you do a search and find that you have a considerable amount of valuable jewellery. Then I would suggest that you seek advice through a quality auction house local to you or one in London.