congrates on the gold its always nice to have that first peice of the year as of the other peice if it were me id look for that k gold mark if not found i would then use those rare earth magnets c if it sticks if it does u know its not gold if it doesnt well then 2 choices bring it to a jewler get apraised or scrap or keep, second if it doesnt stick u could take a small file to a hidden spot that will reveal the metal underneath the tarnish by the looks of it dont think its gold however it mayb gold filled or something hard when its not in front of u