Medium dark, pure blue stones have the highest per carat value, estimated by Sinkankas (Standard Catalog of Gem Values, 2nd. Ed), at $150-$300 in large sizes, followed by blue with a slight greenish cast at about $100/ct. Red stones (always with some orangey hue) in larger sizes may command $100/ ct as well.
Zircon is one of the most billiant natural gems that exist. Unfortunately, natural zircon today suffers for the similarity of its name to cubic zirconia, the laboratory-grown diamond imitation. Some don't realize that there is a beautiful natural gemstone called zircon.
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