The Mizzie I know is a small stone wheel permenently
mounted on a 2/32" dia. mandrel for use in a quick-change
handpiece. It's also known as a Mizzie heatless. It imparts a
rather corse finish which sparkles and is one of the more
durable finishes on gold or silver.
It’s even more widely sold as unmounted wheels. Available in a
rather wide range of diameters and widths. I usually use mizzy’s
about an inch in diameter and maybe 3 mm thick, but I’ve got a
few also, in a small size, maybe about a half inch diameter and
only about 1.5 mm thick or so… The coarse finish the leave is
often referred to as a “stoned” finish, and is common in some
commercial lines. A similar finish can be obtained, maybe even
a bit brighter, with various coarse grit diamond grinding wheels.
One is commonly sold which has only a few quite large grit
particles, made specifically for texturing purposes. It leaves a
quite bright, coarse, sparkling finish…