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Zircon is the best diamond substitute before the advent of man-made cubic zirconia. Zircon has a strong birefringence, that is, it has two refractive index, and the difference between two refractive index is larger. Thus, a very special optical phenomenon is produced, and when a magnifying glass is used to observe the faceted gem of zircon, the top of the surface can be seen to show the double shadow of the bottom face and the ridge line. But the diamond because is "the homogeneous body", absolutely matchless shadow phenomenon.