If you purchase with other items, we will discount 150 yen for each item from the second item onwards. Please let us know if you would like this. (*^^*) Example: 2 items purchased → 150 yen discount 3 items purchased → 300 yen discount ☆ All natural stones will be cleansed before delivery ☆ Size: Approximately 8mm Inner Diameter: Approximately 17cm Included: Certificate of Authenticity (It is not written as Libyan glass, but as natural glass. It seems that this is how the certificate of authenticity for Libyan glass is written.) I love Libyan glass and have kept it because I really like it. I think it has a certain transparency. Highly recommended! Included: Certificate of Authenticity