The perfect gift from Estonia

My honey came home from a trip in Estonia (the Baltic region). He said he bought me the perfect gift - an amber heart pendant with sterling silver finding. So sweet of him! :-) He told me that the heart is made of genuine stone and not imitated amber. I asked him how he knew it was real amber. Honey said he asked the shop assistant to prove that the pendant is made of genuine amber. First, she showed him by testing that the amber heart float on salt water. Second, she showed him amber that rubs against clothes get electric.