The Evil Eye

The Evil Eye is a neutral source of power that can be tapped into by both good and evil. It's primarily used by gypsies who tap into the power of the Evil Eye with a talisman.

Javna
The demon Javna used the Evil Eye to steal the life force from the young and restore his youth. The Book of Shadows described its power as black magic, however, we learn later on in the series that its power is neutral.

Javna used the Evil Eye to enhance his power, shooting red laser beams from his eyes into the eyes of his victims. His other power of Telekinesis was used through these beams as well.

Waffediyok
"That's our family talisman, the evil eye ... Many feared the evil eye but our family was said to be protected by it. The folklore said that the keeper of the eye could use it to magnify or channel her powers."

- Ava Nicolae explaining Waffediyok to Piper and Paige.

Waffediyok (Romani for "The Evil Eye") is an ancient Gypsy talisman blessed with the ability of augmentation, which is the power to increase the powers of its possessor. It is shaped like a cross with an eye in its center. The Waffediyok is the family symbol of the Nicolae family, which Shuvani are the keepers of the talisman.

One of the Shuvanis in the Nicolae Gypsy clan was Lydia Nicolae. She possessed the necklace and used it to augment her power of Optical Energy Blasts; the power to shoot green beams of energy at an opponent.

Lydia probably got the necklace from her mother, who passed the necklace down to her. It could also have been the necklace that her sister used to own before she died of cancer. When Lydia was killed by Cree, the son of Orin, the necklace was passed on to Lydia's niece Ava.

The Waffediyok symbol is also later used by Ava Nicolae to serve as a Gypsy counterpart for the Caduceus/Rod of Asclepius for her free medical clinic that she set up for the local Gypsy community, for Gypsies without medical insurance.

Trivia

 * The Charmed Ones invoked the Hand of Fatima to banish Javna back to Hell. The Hand features an eye on its back, which is possibly the Evil Eye.
 * Both Javna and gypsies use their amplified powers through their eyes.
 * The Waffediyok necklace was sold at the end of the series on eBay by It's A Wrap!.