This is a natural stone necklace with a double strand and a substantial weight. I'm not sure what kind of stones they are, but I purchased it from a shop that sells natural stone parts and the like. I bought it, but it's been difficult to match with my outfits, so it's been stored at home. Of course, you can use it as a necklace as is, or you can cut the string and disassemble it to use the parts to create various things! Each stone is 3-3.5cm. Please purchase if you don't mind that it has been stored at home! Feel free to comment if you have any questions (^^)