agete Ring Indigo light tourmaline in quartz Material: K10 Markings: "AS LABO" and "K10" engraved on the inside Size: Size 11 (possibly up to size 13) * It's a bit unclear whether I purchased size 11 or 13 at the time of purchase, but I believe it's probably size 11. Please understand the margin of error. Indigo light tourmaline in quartz is a very rare natural stone that crystallizes while incorporating blue tourmaline (also known as indicolite). There are no noticeable damages, but there may be some signs of use such as small scratches. Please refrain from purchasing if you are concerned, as this is a pre-owned item stored at home. Accessories: Sales certificate Due to the risk of substitution, returns are not accepted for precious metals.