Zircon is an important gemstone of many colors, and is an historical gemstone used for thousands of years. It is sometimes looked upon as a cheap Diamond simulant, but in actuality it can be a valuable gem.

Color Yellow-Golden, Red, Brown, Blue, and Green
Mohs scale hardness 7.5
Specific gravity 4.60 - 4.70
Refractive index 1.777 - 1.987