Yes. Every Naomi Seoul piece ships with a Certificate of Authenticity carrying a serial number unique to that piece.

The number stays with the piece for life. If it is passed down, given as a gift, or brought back for service years from now, write to us at contact@naomijwly.com with the serial and we will confirm it against our workshop records.

Your 3-year warranty is held on the same certificate.

Diamonds are documented separately. A stone of 1 carat and up ships with an IGI report, and a stone from 0.5 to 1 carat ships with a diamond certificate graded in Seoul to the GIA 4C standard. Those documents grade the stone. The Certificate of Authenticity covers the piece.