This amulet appears to be the frame and shattered glass of a scrying mirror. Its magic focuses your teleportation powers.
Enhancement Bonus: Fortitude, Reflex, and Will
When you use a teleportation power, the distance you can teleport increases by 3 squares.
Power (Teleportation) Daily (Move Action)
You teleport 20 squares.
Published in Adventurer's Vault 2, page(s) 125.