The grade B ruby zoisite crystals in our collections have a slightly rougher texture, the inclusions of red corundum are more visible and minute sparkling crystals can be seen as they catch the light. These grade A stones exhibit deeper and richer colour and have a much finer polish.
Ruby zoisite is also known as ruby in zoisite which is a more accurate description of what the stone is. Although used primarily for decorative purposes, it can be difficult to work with because of the difference in hardness of the two minerals. After diamond, corundum is the hardest natural mineral known to man.
Ruby in zoisite is often mistaken for ruby in fuchsite (fook~site). The two stones have a very similar appearance but ruby in fuchsite is far more common hence also cheaper. The vast majority comes from India whereas ruby in zoisite comes almost exclusively from Tanzania.