Quality, finish, durability. You really want the 16mm opening which is the tisur shackle. Can use all of my marc jacobs bag straps (with dog leash clips) interchangeably.
Magnets are so strong that they grab onto all parts of the necklaces and tangle them before you even put them on. This is my first day wearing this clasp and all day it twists to the front and i'm having to move it back to the back of my neck.