You can have your jewellery valued at most jewellers. I rang around all jewellers in our area to find out what they charged and they varied a great deal. Some used a percentage of what the item would be valued at whilst others had a flat rate of £15 upwards. Make sure though when you have it valued you ask for a certificate for insurance purposes otherwise they won't be covered.
Our jewellery has always been valued between 2-3 times what we paid except for one item. My husband bought a ring years ago from a jeweller in Içmeler but it was valued at the price we paid. We wouldn't have minded if the jeweller had been honest but he told us that the ring was worth a lot more.
We always have our jewellery valued as the 'Guarantee Certificate' is not accepted for insurance purposes. It's surprising how much your jewellery is worth, especially if you've been going to Içmeler for years

SUSANMKENNEDY wrote: I have took mine in shops before now and they have refused to value as they aren't stamped.
We bought a watch a few years ago and my husband needed a few links taken out but we didn't realise at the time that the hallmark was on the links that were removed. It was no problem having it valued, it just says on the certificate that it's gold and that there's no hallmark. We could have a hallmark put on it I suppose but then we'd have to pay for another valuation which seems pointless.