Hi Nikky, Yes, done judiciously your can sand down a cab which is too
high. Obviously it works quicker with softer materials like lapis,
turquoise or labradorite; if it's agate or harder it will take more
I'd use a sanding stick of, say, 220 grit wet-or-dry silicon carbide
glued onto a wooden paint stick or a piece of yardstick. Use it like
a file and keep it wet. Watch you don't sand a flat spot. 220 grit
would be the first step, for quick removal of material. Then go over
it with 400 grit, and then 800; when the stone has a fine velvety
finish without scratches from the preceding steps polish with any of
the usual polishing compounds; you could probably do that on a
little leather disc in the Foredom. Keep it wet; be careful of heat,
now that you're using a power tool.
Cheers Hans Durstling in Sunland California - and appreciatively so,
given the temperatures back home.