Grams' Ring

This ring was once owned by Penny Halliwell. She cursed it in the late 20th century, after four failed marriages and six failed engagements, to transform the wearer into a traditional suburban housewife.

Penny did this to remind herself of what she hated about being married should she ever be engaged again. The ring's inscription reads: "To gain another, is to lose yourself." If the possessor of the ring wears the ring long enough, she will be transformed into a typical housewife; wanting to stay home to cook, clean and please her husband and other guests that she may have.

The ring is one of several things that Grams had put a curse or charm upon. Another example would be her red go-go boots, which takes the wearer to the late 60's, early 70's, as it did to Paige.

Phoebe Halliwell
In 2001, Phoebe Halliwell was given the ring by Cole after he proposed marriage to her. Cole didn't know about the curse. She accepted and put the ring on and was transformed into one of her greatest fears, a classic Bewitched-style 60's housewife or "housewitch", exhibiting the above-mentioned characteristics, rather staying home and cooking than vanquishing an impending demonic threat. Within hours she turned black-and-white. The curse was only lifted when Paige orbed it out of her finger. Once free from the curse, Phoebe let the ring go down the bathtub's drain when she and Cole were sitting together inside.

It was later used in 2006, on Piper in attempt to destroy the Charmed Ones, by the Triad.

Trivia

 * The ring was presented to Penny by her first husband Allen Halliwell; it was stated the ring has been in the Halliwell family for generations; however, it may have actually been passed down from Penny's mother P. Baxter. As Cole did with Phoebe, Allen may have obtained the ring from Baxter, reminiscent of how the family likes to pass things down in matriarchal fashion.
 * When Piper was affected with the ring, she gained Super Speed. It remains unknown if Phoebe also gained this power when she had the ring on.
 * Phoebe tossed the ring down the bathtub drain, yet, Dumain managed to retrieve it five years later.