Modern – Blue Topaz, Turquoise Tanzanite Traditional – Zircon Mystical - Onyx Zircon is a very sparkly gem. So much so that a colorless Zircon may be confused as a diamond. Zircon is a natural gem (formed when magma crystalizes) and not to be confused with the lab created cubic zirconia. It occurs as small isolated or twin crystals in the form of stubby prisms. In it's purest form, Zircon is colorless but with the inclusion of impurities other colors such as brown, orange, red, blue and green emerge.