What's the best way, from your experiences, of selling jewellery?

I have some things that I want to be rid of but don't know how to sell them. I think they are definitely worth more as items than gold, itms?

One is a pair of Tiffany earrings, not sold anymore, so I think to the right buyer they'd be worth heaps. The other is a bracelet with rubies and a couple of very small diamonds.

I've tried eBay for the earrings, no joy. Called Tiffany to ask if they recommend anyone to sell, big fat NO.

Any ideas???