Lapis Lazuli Rough
We have lapis in one grade: "B" grade - Dark color with pyrite and some calcite
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.