Lovely single pearl ring. Band measures 16.9mm in diameter and has been sized in accordance with the ring size guide in the last picture. Sorry, I do not have any information regarding the metal or gem stone content of any of the jewelry pieces in my closet. ***Bundle and Save!*** Likes may receive offers, but bundles of 2 or more items get automatic 20% off! Bundles of 6+ items will receive FREE SHIPPING!!! (just let me know when you're finished adding to your bundle, and I'll put through the offer)