Thank you for viewing! (*^^*) This looks like onyx, but it's actually rainbow obsidian. You can see various colors of schiller when you shine a light on it. The effects of natural stones are not scientifically proven, but wearing them can make you feel "safe," "confident," and "motivated," and brighten your mood. If you don't know much about stones... start by choosing the effect you need, or the color and design you like, and try holding one in your hand♪ ☑ Size: Inner diameter approx. 16.5cm ☑ Material: Natural stone 【 Rainbow Obsidian 10mm 】 A stone that illuminates the rainbow light in the darkness and leads to realistic happiness. It is said to purify negative energy and trauma, and to help stabilize emotions. It is useful for overcoming adversity and developing strong mental strength and perseverance. ☑ All metal parts use alloy. Please be aware if you have metal allergies. ☑ Uses Opeon rubber (black). Instant purchase is OK ◎ Please purchase after reading the profile (*ᴗᴗ)⁾⁾ If you wish to adjust the inner diameter or purchase multiple items, please consult in the comment section. We will accommodate color changes of parts as much as possible. 【Please note】 ・The effects of natural stones may vary from person to person, so we cannot guarantee them. ・Due to the nature of natural stones, there may be fine scratches, dents, inclusions, and variations in color and pattern, even within the same stone. ・The images are adjusted with corrections to convey the colors as close to the actual product as possible. The appearance may differ depending on the lighting, natural light, and angle. ・The inner diameter is listed, but there may be errors due to measurement on a design board. ・Opeon rubber may break if pulled strongly. Please be careful when wearing. I create each one with care, hoping that it will be cherished and become a support for someone, somewhere. May you have a wonderful encounter...☆ ‪#LULULUSTONE ‪#NaturalStone ‪#PowerStone ‪#RainbowObsidian ‪#Rose ‪#Purification ‪#Healing ‪#MentalStability