Inner circumference: approximately 17cm ◇【Made in India】 ★June Birthstone★ The soft pastel green is lovely and highly recommended for women(^^) Although the schiller effect is only faintly visible, the very gentle pastel green is soothing to the heart(´˘`＊) ◇Stone Keywords◇ Stress reduction. Gently heals past sorrows. Enhances intuition. As these are natural stones, there may be cracks and inclusions. Please purchase only if you understand this.