I use diamond, topaz and sapphire chisels as my primary chisels now because I like making gem tools and I’ve gotten used to the base action speed on them vs the alloy ones. They also have a higher base durability anyway, but I usually add some more with forging.
Typically my block-changers have been amethyst and unchisels are ruby lately. Having 5 different types makes it easy to visually distinguish which one does what for me.