Inner diameter: approximately 16 cm, perfect for the size board. Rutile quartz: approximately 10mm, early half. Please understand that there may be some errors. ⚠ When purchased, dark-colored rubber was used, and the color remains in the bead holes. I think this is because I was given old stock, and the colored rubber was inside for a long time. I do not recommend this for those who are concerned about this. Currently, rutile quartz is also quite expensive. I soaked the same lot from the same supplier in alcohol and wiped it with acetone, but I couldn't completely remove the rubber color. The color did not come off from the inclusions even with alcohol and acetone. The rutile is natural and not colored. Rutile Quartz There is some cloudiness in the crystal, but there are many glittering gold rutiles included, and it is beautiful. As it is a natural stone, there are cracks, inclusions, natural dents, black spots, color unevenness, fine scratches, etc. Natural stone Natural stone bracelet Design bracelet Rutile quartz Gold rutile Taitin rutile Power stone