Emerald Necklace

The Emerald Necklace is a magical item that contained the warlock Lascaris. The necklace is only featured in Kiss of Darkness.

Description
The necklace consisted of a beautiful, gleaming oval emerald surrounded by engraved gold, and hung from the end of a gold chain.

Book of Shadows
''The emerald necklace belonged to a witch who fought a very powerful warlock named Lascaris. The witch imprisoned Lascaris inside the emerald with a spell that gave the warlock only one chance to escape every century: at 12:01 A.M., New Year's Day.''