I've used this about twice! Since it's been used, it's clean, but I'm listing it as having no noticeable scratches. m(_ _)m As it's stored at home, there might be some imperfections like odors, so please refrain from purchasing if you are concerned or overly sensitive. Material: AA Tourmaline, approximately 8mm (Only the dark blue stones are the rare Kyanite.) ● Inner diameter size: Approximately 150-160mm Stone Meanings: ☆ Tourmaline: [October Birthstone] Japanese name: Electrical Stone. It's a beautiful, multi-colored natural stone. It is said to enhance understanding and concentration, and to make one more sensitive. It also has the power to activate and strengthen the mind and body. Tourmaline also emits negative ions, which have a relaxation effect. ☆ Kyanite: This beautiful, vivid blue stone is said to represent obedience, adaptation, normalcy, purity, and innocence. It is said to enhance calm intuition and judgment, allowing you to see various things clearly and giving you the courage to move forward.