Ancient man either saw an alien visitor or they saw a local fish. Which scenario is more likely is yours to decide. Solid loop on pendant requires the necklace of choice to have a termination/clasp feature which is smaller than the loop ID.

Print one in metal at:
https://www.shapeways.com/product/DHHUNUV9F/quimbaya-fish-pendant?optionId=41236365&li=marketplace