Chrome Hearts is a luxury brand from Hollywood and in 2017, they created a Rubik’s cube in 0.925 sterling silver. While incredibly flashy, it is usable and has six sides marked with symbols such as daggers, hearts, and stars in replacement of colours.
It was originally priced at $6,600 (USD) on the Chrome Hearts website but it has long since been sold. I did find a Depop listing for one, priced at $12,500 (USD).