Lapis Lazuli Rough
We have lapis in three grades:
"B-" grade - Fine color with calcite and some pyrite
"AA+" grade - Fine color with a tiny bit of calcite and some pyrite
"AAA" grade - Fine color with some pyrite
Lapis is easy to cut, but takes a little extra work to get a good polish. We've found this material takes a reasonably good polish with tin oxide or diamond, followed with green rouge (Zam is a brand name for green rouge). Lapis can have interesting figuring that produces very attractive cabochons and carvings. Mohs hardness 5.5 to 6.