Two remarkable color-changing alexandrites totaling approximately 4.23 carats are surrounded by approximately 2.92 carats of brilliant diamonds in these incredible earrings. Alexandrite is one of the rarest varieties of color-changing gemstones. The chameleon-like qualities of the stone stem from the complex way in which it absorbs certain types of light. Viewed in the daylight or under fluorescent light, these alexandrites display a yellowish-green hue, while incandescent light changes its color to a rich brownish-purple. The phenomenon has led many to describe this rare gem as "an emerald by day, a ruby by night." These alexandrites are certified by the Gemological Institute of America (GIA) as being natural alexandrites, meaning they have undergone no treatment or enhancement to achieve their unique color change. Set in platinum.