Approximately 6mm to 10.5mm. This is a bracelet woven with 22 kinds of sparkling gemstones. From the Tanzanite indicated by the second arrow: Sugilite Amethyst Kunzite Deep Rose Quartz Tourmaline Lepidocrocite in Quartz Sunstone Garden Quartz Agate Pink Opal Tourmaline Rutile Quartz Green Garnet Chrysoprase Jade Tourmaline Diopside Chrysocolla Apatite Larimar Kyanite Silica Perfect for handmade crafts! Get 50 yen off for every 2 items, so please take advantage of it! ♡ To prevent trouble: There may be natural cracks, scratches, dents, and inclusions unique to natural stones ◡̈⃝︎⋆︎* There will inevitably be an error of approximately ±0.5mm, so I have indicated the size as approximately ○mm♪ There is nothing as perfect as artificial glass. Please understand this before purchasing ◡̈⃝︎⋆︎*