I tend to buy a pair of earrings and then wear that one pair day in and day out for five years. My current pair is made by Alice Roche, and she's having a summer sale through Wednesday. Lots of her necklaces, earrings, bracelets, and rings are 50%-70% off, and the inventory is going fast.
P.S. In case you're wondering, Alice's dad is the architect Kevin Roche.