Go Stones Mold

This kit can be used to make Go stones with self-hardening clay.

V3.3 produces stones having ~21mm diameter, V3.4 ~22mm

Put some plastic wrap between mold and clay to avoid it sticking to the mold.

For very smooth stones, you can wet tumble them (wait for them to dry completely; put them in a jar with some water - 10ml for 40 stones - tumble for 10 minutes; wait until they are just damp - retumble without any water for 5 mins)

You can also try tumbling them.

Crafting Instructions here