An Exceptional Alexandrite and Diamond Ring

Alexandrites are a rare and captivating variety of chrysoberyl, renowned for their color-changing properties. Discovered in the Ural Mountains of Russia in the early 19th century, the stone was named after Russian Czar Alexander II, who was born around the time of its discovery. Often described as “emerald by day, ruby by night,” alexandrites exhibit a striking shift from green in daylight to reddish-purple under incandescent light, a phenomenon caused by their complex crystal structure.

Today, the finest gem-quality alexandrites primarily originate from Brazil, Ceylon, and East Africa, with Brazil and Ceylon being the most esteemed sources. Regardless of their origin, top-quality alexandrites—such as those offered as lots 20 and 21—are distinguished by their exceptional color change and strong saturation. These characteristics set them apart from lesser examples, making them highly coveted by collectors and connoisseurs alike.