The most expensive Rubik’s Cube was the Masterpiece Cube, produced by Diamond Cutters International in 1995 for the 15th anniversary of the Rubik’s Cube and made with 185 carats of precious gems.

The actual-size, fully functional cube features 22.5 karats of amethyst, 34 karats of rubies, and 34 karats of emeralds, all set in 18-karat gold.

The world’s most expensive Rubik’s Cube is estimated to be worth $1.5 million.