Emerald Cut Alexandrite Solitaire Ring 10k Rose Gold Twisted Band Ring Unique Alexandrite Engagement Ring Unique June Birthstone Ring GiftThe 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 : 925 Sterling Silver (Hypoallergenic, Nickel Free, Tarnish Resistant) Solid 10K 14k 18k gold, platinumPLEASE choose silver or platinum if you are allergic to nickel. Main stone : 6x8mm