Beats Viserys Targaryen's crown.
Pouring Molten Metal Over Orbeez To Make A Mermaid Crown

This is a video of Youtuber and “science dude” Joe Myheck making a mermaid crown by pouring molten Nordic gold (a gold-colored alloy of copper, aluminum, zinc, and tin) into a trash can filled with Orbeez beads. The result is beautiful, and there’s no doubt in my mind that crown would get a special shelf in Ariel’s grotto. She loves stuff made on dry land.