Approximately 11mm per bead Inner diameter approximately 17cm I don't have anything to measure with, so I'm comparing it to other bracelets. There may be some size discrepancies. Please understand. Purchased from a reputable natural stone seller! I kept it for display, so it's unused. The gradation is beautiful. I used it once at home. Stored at home. The photos were taken with an iPhone, so the colors may be slightly different. Please refrain from purchasing if you are sensitive to these details. ※ The crystal is not included.