A toggle necklace is a type of jewelry that features a unique closure mechanism known as a toggle clasp. This clasp consists of a bar that is inserted through a circular loop to secure the necklace in place. The design not only serves a functional purpose but also adds an aesthetic appeal, making the clasp a focal point of the necklace. 

A floating necklace is a type of necklace that hangs down from the wearer's neck and has a pendant or other object that "floats" in the middle.