2.5mm Diamond Charm in 14K Yellow Gold Bezel Setting (1 Diamond, 0.02 Carats). Jump Ring size is about 2.5x0.6mm, but may vary slightly. You can fit chains and thread as thick as 1.1mm through the jump ring. If you want to wire wrap this item, we recommend 24G or 26G, but you can use as thick as 20G. You can also squeeze the jump ring slightly to make it an oval.