Happy New Year Jack, and thanks for the comment.
The White stone is New Zealand Limestone from Oamaru. The Gray Stone is a from a area of Hinuera and is a Sand stone. When finished just seal with a water proof sealer. I mainly just use old wood working chisels to finish, anything from Saws to axes for roughing out. These were done in my home town of Whakatane at a Symposium where only hand tolls are permitted.