This necklace is hand crafted from sterling silver. I personally make each link, put the whole design together, then solder each ring. The toggle clasp is also handmade. The necklace measures about 20 inches from end to end and it sits right at the collar bone. It can be worn with the toggle on either side, left or right.. The largest circle is about 2.25 inches in diameter and the smallest is .75 inches; the rings that make up the back part of the chain are about .5 inches in diameter.