In many stores, you are entitled to the item at the price it was displayed for. Even if was the wrong price tag.
I think the store realised this, why else would they not have been completely upfront with the OP when they realised their error?
So the OP thought she was getting a great bargain, when in reality paid average price for an average item.
ETA- OP, if you viewed the sterling bracelet with the cheap price tag attached, (I *think*) you are entitled to pay that advertised price. Instead they sneakily swapped it without telling you to avoid selling that item cheaply?