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Ruby in Zoisite Slabs from Tanzania
Ruby-in-Zoisite is a blend of two materials: crystaline aggregates of green Zoisite, and Ruby inclusions. This creates a lovely combination of colors, the green from the zoisite and a red/pink from the ruby. Ruby-in-Zoisite takes a good polish with diamond. Mohs hardness ranges from 6 for the zoisite to 9 for the ruby. The ruby tends to be chatoyant, but it also can chip out during cutting. Therefore, careful cutting with finer wheels is required to get a quality finish.