Thank you for viewing. This is a single aquamarine rock earring from MONAKAjewellery. It has a smoky, slightly grayish-blue color. I loved the size, but I have accumulated more rock earrings from Monaka, so I would like to offer this to someone who is looking for one. I have the box, etc., but I can't find the certificate of authenticity. I will sell only the earring, and at a reduced price. The clasp is stamped only with "k18". It's less than 5mm thick, so it's relatively easy to put on and take off. Please feel free to ask any questions in the comments section.