Unused since purchase. 13mm Inner diameter approximately 16cm This is a power stone bracelet purchased by siblings and has been stored away since then. They asked me to sell it. It seems they purchased it from Tiida Stone, who are very popular on Instagram live streams and handle beautiful power stones. Neither my siblings nor I can adjust the inner diameter, so this is suitable for those who can do it themselves or have it done at a shop. Power Stone Notes: In the past, I had a very difficult experience with someone like this: → "I can feel the power of natural stones." "This isn't the power of ◯◯ stone, so it's a different stone, please give me a refund!" or "I looked it up on an app and it said this isn't ◯◯ stone, so I want a refund!" Those who make such claims should purchase the item in person at a shop. Looking at the reviews of the app they mentioned, several people wrote that it was unreliable and untrustworthy. This is a purchase from a reputable shop, so I would appreciate it if such people would refrain from purchasing. Photographing natural stones is very difficult. We do not accept returns due to differences from the photos.