Hi I am after a tiffany legacy for my girlfriend. I have a budget of £4000 GBP about $8000. I would like to get the best value for money. I am open to the diamond, aquamarine or yellow version. please could someone offer some advice if there is a good second hand market in these rings on the internet (ebay etc) or if i need to pay the huge markup of tiffany. Also what can I expect to get for my budget.