Taking a break from literal gem dice to show off the best d4s ever made. Not only are these not caltrops waiting to pierce slippered feet at night when a stray one happens to be right where you're stepping in a rapid trip to the bathroom after a night of drinking way too much tea while playing RPGs, they also roll much better.
Whoever invented these is a genius.
I like those fine (and have a set), but I kinda view them as "cheating" when you have numbers repeating to get a lower number of sides. I'm always impressed by how clever people can be in designing these things. ๐