Size: Diameter 11.5-11.7mm Inner circumference: 16.5cm Rhyolite in quartz is a rare stone that emits very bright energy. It has a vivid appearance, and just looking at it gives you a warm, embracing feeling. It powerfully pulls a negative heart towards positivity. Motivation will well up, and it should raise your spirits to their peak. For those of you who are taking on a challenge, rhyolite in quartz should be a reliable companion. We offer a discount of 200 yen for each item from the second item purchased. 2 items purchased: 200 yen discount 3 items purchased: 400 yen discount 4 items purchased: 600 yen discount Thank you!