Necklace | Devil May Cry | Perfect Amulet

Devil May Cry
When a mysterious villain threatens to open the gates of Hell, a devilishly handsome demon hunter could be the world's best hope for salvation.

Cursed to live as both monster and man, Dante must spend his life fighting the demonic forces of darkness. Brandishing his sword, Rebellion, and his always-loaded guns, Ebony and Ivory, Dante is more than happy to send the demons back to hell—especially when there’s money to be made. The wildly popular video game is now a series, and this time, there’s no sympathy for the devil.

The Perfect Amulet is an ornate amulet which serves as a key to the Temen-ni-gru's gate to the Demon World, and is also necessary to awaken the Force Edge. A large red gem is set into the amulet, and it can be split into two halves. It was given as a gift to Eva by Sparda, and she gave the halves to their twin sons, Dante and Vergil, on their eighth birthday. Their names are engraved on the back of each half.

(from Fandom Devil May Cry Wiki)