Gold jewellery shock

BowerBadgers

When I was a student, 38 years ago, I won a short-story writing competition in a glossy women's magazine. The prize was advertised as £5,000 of gold jewellery designed for me by a high-end London master jeweller. I chose and received a necklace, two bangles - one with several tiny diamonds in - and a brooch. I didn't receive a valuation certificate, as had been promised.
Gold jewellery isn't really my thing, though - silver suits me better and I never went anywhere glamorous - so I never actually wore it.
Nearly four decades on, I've decided to try to sell it. Two dealers have valued my jewellery at just over £2,000 - quite a shock considering how much gold has soared since 1987 (about eight times as much, I think).
The original master jeweller is now retired but his daughter has since taken over the business and put it in her name. Unfortunately she is not responding to my emails or phone messages. The magazine is no longer published.
I think I will have to shop around for valuations and accept what I can get, even if it's less than half the original value and a fraction of what it should be worth. 
Does anyone have any better ideas? Thanks in anticipation! 

comeandgo

There is duplicate post in consumers right where you posters did give you answers.