The reason we do not include a certificate of authenticity is because there is no central certifying body in the world for Baltic amber, so anyone who is giving those out is basically typing them up on their computer and printing them off. To us that feels shady, so we don't do it. :) That said, all of products are 100% Guaranteed authentic, meaning if you're not convinced of it's authenticity, we will happily accept it as a return for a full refund. All of our Baltic amber comes directly from Lithuania, we test every shipment, and we have a long and trusted relationship with our supplier. In fact, we made a visit to Lithuania to check out their operations in person and you can see pictures from our visit! (tap here)