Set of 8 Sterling Silver Stackable Rings

Set of 8 silver stackable rings. The larger pieces, and the waved rings are all sterling silver. The wavy ones are from Torino BC, while the black one is an obsidian gemstone. All range from a size 7 to 7.5, though the largest piece may be a 7.5 or 8. The last image showing the small textured ring was purchased secondhand, and not sure if it’s sterling silver. Though all the rest are sterling silver.