It’s always hard for me to pick favorites honestly, there’s just too many I like for different reasons! Still, Amethyst is very pretty, especially when polished~! Ruby’s probably an obvious favorite of mine, but especially for it’s rich red color! Quartz~ Well, quarts may be only semi-precious, but it’s very useful, very pretty, and very common~! Everyone can have a nice gem for little if they like quartz!