erm... dont you just need 4 S jewels from the box under that ring?
Nope, in order to make the final SS Master ring, you need 4 S rank rings, in order to make 1 regular S rank ring you need 1 jewl crafting ring + S rank jewl. so with only one jewl crafting ring in the shop you can only make 1 regular S ring and not the SS Ring.