Patty Halliwell's Ring

Patty Halliwell had a  Ring while she was alive, which the sisters kept for years after her death to remind them of her.

Piper Halliwell eventually gave the ring to Leo Wyatt, so he could give it back at the perfect romantic moment. Unfortunately, he lost it because of all his orbing around with it in his pocket, but, thanks to a Lost and Found Spell cast by Phoebe Halliwell, the ring was recovered. It was later used as Piper's wedding ring after her Handfasting.