Ruby Zoisite Crystals from Tanzania

Fine-grade ruby zoisite crystals cut from material mined in Tanzania.

Ruby zoisite, which is relatively rare, is a combination of the minerals green zoisite and red corundum. Black crystals of hornblende are also often present. Gem-grade red corundum is ruby.

These grade-A ruby zoisite stones exhibit a deeper and richer colour than lower-grade material and have a finer polish. Not all of the stones have visible red corundum.

We also have AAA-grade ruby zoisite tumbled stones in our collection, and grade-B. 

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 tumbled stone. Size can vary from piece to piece. 

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