A jeweller yonks ago told me it was worth about £800. No not like the one one ebay more filigree like and delicate. It amazes me that people will buy, unseen expensive goods on ebay. I certainly wouldn't most I have spent on ebay is £40.
I once heard of a shop in cambridge that put your jewellery into window and if it sold they took 20% of sale price in commission. This sounded good bet so wondered if there was similar in London.