Power Stone Interchangeable Natural Stone Silver Ring - 1 piece Size: 7 (Size 6 is also listed!) Natural Stone Color: Pale Lemon I don't know the type of power stone > < Discount if you buy 2! You can customize it by changing the natural stone to match your mood or outfit! The ring base is made of silver 925 material and has a form that makes the stone look beautiful. You can freely change your favorite power stone (8mm-8.5mm) and enjoy it. There are no scratches or stains, but it has been stored for a long time. Please understand before purchasing. :)