8.5-8.8mm. Inner circumference: 17cm. Adjusting the inner circumference smaller is free, but it can be changed to 18cm for an additional 100 yen. ★Scolecite is characterized by a soft, milky lavender color. As a mineral, it is a type of quartz and is a rare natural stone currently only found in Brazil. It is also known in the market as lavender quartz.★ ☆Scolecite's Energy☆ Restores your sense of self Enhances awareness and sensitivity towards love Leads to meeting the best partner Provides healing to the heart Helps you to love yourself more ※ If you wish to purchase multiple items, we will offer a discount of 100 yen per item from the second item onwards. ※ Immediate purchase is welcome ^o^ We will prioritize those who purchase immediately, even if there are comments in progress. ※ There may be inclusions and dents unique to natural stones. Please understand this as a characteristic of natural stones.