noun cab·​o·​chon | \ ˈka-bə-ˌshän  \

a gem or bead cut in convex form and highly polished but not facetedalso : this style of cutting

There are many lapidary tools available to use in creating cabochons. I run a Lortone 6", 6-wheel grinder/po;wisher and a Titan 8", 6-wheel. A variety of flat wheels, round wheels or belts can be used.