18 karat white gold earrings with two round natural blue zircons totaling 1.40 carats and 40 round diamonds totaling .10 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-it sparkles!