This is a crack quartz bracelet, with artificial cracks added to the crystal. Some beads also display rainbows when light hits the cracks at certain angles. Like regular quartz, crack quartz is believed to aid in purification, good luck, and other benefits. However, the cracks are said to enhance the power of purification, expelling negative energy from the body and refreshing both mind and body. The rainbows seen in the cracks are also said to attract good fortune. Size: Inner diameter approximately 14-14.5cm Crack Quartz: Approximately 8-8.5mm Operon Rubber (White) * As natural stones are used, there may be variations in size, shape, color, and imperfections such as chips, uneven surfaces, and cracks. * The size of each bracelet may vary by approximately 0.5cm. Also, due to manual measurement, there may be an error of approximately 0.5-1mm per bead. * This measures the inner diameter. We recommend measuring the inner diameter of your existing bracelets or watches before purchasing. * The photos are intentionally darkened to make the cracks and rainbows easier to see. * Due to the cracks, the bracelet is prone to breaking. We will take all possible measures during shipping, such as using double cushioning material, but we cannot rule out the possibility of breakage during delivery. Please understand this before purchasing. * We do not accept price negotiations or discounts on individual items. We also do not accept price reductions through the "suggested price" feature. * We do not accept returns or refunds for reasons such as a difference in image, a difference in size, damage or trouble due to shipping accidents, or after evaluation. Please understand this beforehand. * Shipping is planned via Yu-Yu Mercari delivery service.