We've all been there: You go to pull out a necklace that you haven't worn in quite some time, only to find it's become enmeshed with other necklaces in your jewelry box or tangled up around itself.

Few tasks are more frustrating and tedious than trying to untangle a tight knot in your favorite necklace, especially if you're in a rush or the piece has a special meaning to you. Yet the fine chains ...