The swinging 1970s may be known for re-popularizing the menage a trois, but this vintage collar necklace from day-lab from the era is our idea of the perfect threesome.

This dead-stock, mint piece comes with three marbleized plastic rings to change out whenever you get bored. So really, this is like owning three necklaces for the price of one. (And what is the price exactly? A very reasonable $18.)

This screams out for something tied to the time--a black turtleneck and wide-legged houndstooth pants? A Pucci pantsuit? A white bikini and cork platforms? Yes, yes, YES!