The Gem of Amara was a magical ring that granted a vampire wearer complete invulnerability to all their usual weaknesses, making them essentially unkillable.

The ring granted the wearer enhanced regenerative powers, allowing them to survive staking, which would traditionally kill a normal vampire, as the wound would close and they would not dust. However, it’s most notable effect was granting immunity to harmful effects of sunlight, thus allowing the vampire to hunt in broad daylight. It also rendered vampires immune to crosses and fire.

The Gem of Amara was destroyed by Angel, who decided to destroy it, understanding that if he kept the ring he would be in danger of forgetting about his mission; while the Gem would allow Angel to help people in daylight, they already had help from the rest of the world, and it was his duty to protect those in the dark who could not ask for help themselves.