This ornamental material is found in Tanzania and the general appearance is unmistakable. There isn't another stone like it in the mineral world. The stone is difficult to cut because of the differences in hardness, and usually diamond tools will be used. Zoisite has been known for nearly two centuries as an ornamental stone. The medium grade red ruby material is usually spread irregularly throughout the green zoisite. It is one of the most colorful of ornamental stones.
Composition: crystalline aggregates of green zoisite mineral, with non transparent ruby inclusions
Mohs-scale hardness: Zoisite 5.5 - 6.5 Ruby inclusions 9