An ornamental material consisting of crystalline aggregates of green zoisite with non transparent ruby inclusions it is found in Tanzania and the general appearance is unmistakable.
There isn’t another stone like it in the mineral world. The green zoisite is relatively soft, between 5.5 – 6.5 while the ruby inclusions are usually quite hard, 9 on the Mohs scale. This can make the stone 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.