7mm Round Alexandrite Wedding Ring Vintage Color Change Gemstone Rose Gold Alexandrite Engagement Ring June Birthstone Jewelry for WomenThe 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 goldPLEASE choose silver if you are allergic to nickel. Main stone : 7mm round lab Alexandrite