These are natural, Wild earth-mined alexandrites - not lab grown. The color changes from a vibrant cool green to a soft pinkish grey. These gems are among the rarest and most precious in the world. The heavy sterling silver earrings were designed around them - to showcase them to their fullest. The gems nestle as the pinnacle of a heavy cast pyramid: the prongs that secure the stone are a poetic continuation of the four corners of the pyramid. Secured with friction backs.