Inner diameter: approximately 16 cm Bead size: approximately 12 mm - 12.8 mm Please note that there may be slight variations. ⚠ There are images where the blue appears dark. Image 1 is the closest color. No appraisal certificate is included! The color is darker than item ① currently on sale, but the grade is lower with fewer inclusions. The supplier called it blue sagenitic quartz, but I was concerned, so I had it appraised. Appraisal completed. Please check images 12 and 13. Colored material is used. There are small holes in the quartz, and the colored material is packed and sealed in them. The colored material is colored, and if a large amount is used, it will be identified as dyed, but in this case, it is considered natural quartz because the amount used is small (trace). Please check image 11. (Not in the beads incorporated in this bracelet) Almost none are present, but they are rarely seen. Other colors and inclusions are natural. Spherulitic Spherical Dumortierite in a pale blue color is included in granular form, which I think is cute and rare. As it is a natural stone, there are cracks, inclusions, natural dents, black spots, color unevenness, fine scratches, etc. Natural stone Natural stone bracelet Dumortierite in quartz Spherulitic Dumortierite in quartz Rare stone Power stone