A wonderful alternative to diamond studs, these zircon look-alikes have a beauty all their own, and they are natural and untreated as well.
White zircon used to be the most popular diamond substitue before the advent of cubic zirconium ("diamonique on JVC TV) and moissanite, both of which are lab created and have nothing to do with natural zircon.
Like diamond, zircon has very high dispersion and refractive index which contributes to the bright sparkle. In addition, it has high birefringence (double refraction) and density.
Although not as dramatically sparkly as diamond, zircons exhibit a wonderful softness and colorfulness--very beautiful indeed, in their own right.
If you're bothered by conflict (blood) diamonds, natureal zircon is a perfect substiture.