Blue Oval Zircon from Africa

About Zircon

Zircon is a natural zirconium silicate mineral, ZrSiO4, crystallizing in the tetragonal system. Its colours range from colourless to yellow, orange, red, brown, green and blue; colour zoning can occur. Transparent, well-cut material shows strong brilliance because of its high refractive index, along with noticeable fire and double refraction. Hardness is about 6.5–7.5 on the Mohs scale, but zircon can be brittle and may chip…