The cabochon is slightly curved on the surface, and is affixed to the ring base securely with glue. Ring is one size fits most, approximately size 6-8. Please click on all the pictures. They really give an idea of how changeable this ring is in terms of color.
I have several other paua shell rings in my shop in different colors and settings. You can see them by clicking on this link: http://www.etsy.com/shop/LittleBearsMom/search?search_query=paua shell ring&search_type=user_shop_ttt_id_5499623&shopname=LittleBearsMom
As with all rings from LittleBearsMom, this ring is nickel- and lead-free.
Please read my shop announcement http://www.etsy.com/shop/LittleBearsMom and policies http://www.etsy.com/shop/LittleBearsMom/policy before ordering. Thank you ☺