They make great progress in cutting the crust (Ridgways) or alabaster, and also cut marble, but the harder sorts soon blunt them.

At any rate, marble does not do for the medallions, as its grain prevents its being cut smooth, and its semi-transparence hurts the effect.

I think Bristol lime, or shell lime, pressed in your manner, would have a good effect.

When you are at leisure, I shall thank you for a few pieces, and if some of them are made pink or flesh colour, they will look well.

I used the ball quite perpendicular, and it cut well, as most of the cutting is sideways.