Cluster Alexandrite Engagement Ring Oval Alexandrite Cluster Wedding Ring Unique Diamond Moissanite Bridal Ring Promise Ring Gift for HerThe Alexandrite ring Often described by gem aficionados as emerald by day, ruby by night, alexandrite is the very rare color change variety of the mineral chrysoberyl. That is why the color of Alexandrite changes under different lighting conditions. DETAILS: Material : Solid 9K 14k 18k gold 6x8mm oval lab created alexandrite . The side stones are lab alexandrite, moissanites. The band width is about 1. 4mm.