18 karat white gold earrings with 2 oval natural blue zircons totaling 4.71 carats and 82 round diamonds totaling .28 carats. Glacier Ice is a specific variety of Zircon, with an exceptionally deep blue color reminiscent of Alaska's glaciers. Zircon is a natural stone (not to be confused with Zirconium), and with the highest refractive index of any colored stone-they sparkle!