Silver Obsidian Bracelet Square beads: Approximately 9mm Round beads: Approximately 6mm The size is approximate, measured with a measuring tape as I don't have a natural stone measuring device. ★ I will be listing my overflowing collection of natural stones. ★ Please understand that any dents, scratches, or chips in the natural stones are natural occurrences. Please purchase with the understanding that these are natural stones. If you are looking for a perfect stone, please refrain from purchasing. ★ If you would like additional angles, please let me know. (If you purchase without requesting additional views, we will not be able to address any issues regarding the condition of the product.) ★ Basically, we will not accept any communication after the product arrives.