Gold is celebrated for its resistance to tarnish

https://www.telemundo.com/shows/al-rojo-vivo/curiosidades/double-eagle-moneda-de-oro-que-sera-subastada-podria-ser-la-mas-cara-de-la-historia-tmna3871301

Gold is celebrated for its resistance to tarnish, making it ideal for heirloom pieces that can be passed down without losing their luster.