Ruby zoisite also known as ruby in zoisite is used primarily for decorative purposes. It can be a difficult stone to work with because of the difference in hardness of the two minerals. After diamond, corundum is the hardest mineral on Earth.
Ruby in zoisite is often mistaken for ruby in fuchsite (fook~site). The two stones look very similar but ruby in fuchsite is far more common. The vast majority comes from India whereas ruby in zoisite comes almost exclusively from Tanzania.
These ruby zoisite crystals are a medium sized stone. Weights and sizes vary slightly from piece to piece.