Here is Gwyneth wearing one well:

via fabsugar.com
another good one:

LOVE this shark tooth pendant from Givenchy:

Givenchy shark tooth necklace

McQ Alexander McQueen razor blade pendant necklace
Push by Pushmataaha Nubian pendant necklace
Push by Pushmataaha Nubian pendant in chrysocolla necklace
Gabriella Artigas stick pendant necklace
