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Zircon is a natural, magnificent, and underrated gemstone that has been worn and treasured since ancient times. It’s not cubic zirconia. Available in many colors, zircon is one of the modern December birthstones and will look wonderful in jewelry if set carefully. Zircon is zirconium silicate, belonging to the group of nesosilicates. Origin of name: from Arabic zarqun and Persian zar = gold, gun = color. Zircon is a natural forming mineral and it is not related to the synthetic diamond substitute Cubic Zirconium which is created in a laboratory. Zircon has a high refractive index and can be used to imitate diamonds. It is found in Australia, India, Brazil, and Florida, Cambodia, France, Myanmar, Thailand, Nigeria and Tanzania. Zircons found at Jack Hills in the Yilgarn Craton Western Australia are the oldest minerals found so far with an age of 4.404 billion years.
Color: Zircon can come in red, brown, yellow, green, black or colorless. The color of zircons below gem quality can be changed by heat treatment. Depending on the amount of heat applied, colorless, blue and golden-yellow zircons can be made.
Hardness: 7.5
Cubic zirconia or CZ is a synthetic variant of the mineral baddeleyite which is extremely rare in nature. It is the oxide of the metallic element zirconium, zirconium dioxide. It was first used in the Russian space program to serve as a window to photograph through, it was not used in jewelry until 1969 when somebody decided to facet the material. It is often used as a diamond simulant. Cubic zirconia should not be confused with zircon, which is a rare naturally occurring gemstone.
Color: By adding other minerals in the creative process CZ's can come in any color as well as the colorless variety.
Hardness: 8.25-8.75