Golden Sacred Mayan Calendar necklace on silver stainless steel chain. The ancient Maya were accomplished observers of the sky. This image shows Maya animal constellations found in the Paris Codex. Using their knowledge of astronomy and mathematics, the ancient Maya developed one of the most accurate calendar systems in human history. Pendant is brass. Choose with or without chain. The chain is 50cm. Stainless steel is a highly durable metal, allowing it to withstand the wear and tear of everyday activities, which can otherwise damage a ring. The hard metal resists scratches and corrosion thanks to an invisible layer of chromium that prevents oxidation; this makes it a wonder metal of choice for body jewelry. 100% lead free.