Sphalerite

This is one of the most firey gemstones you can find outside of Spessertine Garnet with its range of yellows, oranges and reds often merging to create multicolored gems that resemble a brightly burning firey flame. Speaking of fire Sphalerite has more fire then a diamond, meaning it essentially sparkles more because of its high dispersion rate. Sphalerite is the primary ore of zinc as a zinc sulfide mineral created within hydrothermal vents. These gems that look like frozen flames make for bold, intense, passionate, and fierce statement jewelry that captivates anyone who sees it

Hardness: 3.5 -4
Composition: (Zn, Fe)S