I just avoid jnats all together.. way to many confusing names to deal with.. okimodo tomayushi nagatosagi yoshikusitaka..
To those that enjoy and learn Japanese naturals I salute you.. truly learning the names and differences must be half the battle. Then learning the stone...
Nope , you just need to tell the seller what you wanna do with the rock , then it's up to him to hook you up if it can be done.