Incredible Sterling Silver Lab Created Color Change Alexandrite Ring Head Size 0.75" x 0.4", Weight: 3.5 grams; solid .925 Sterling Silver Lab Created Color Change Alexandrite, Changes color from purple to green; Color change is as follows: Purple under daylight and incandescent light; Green under fluorescent light. Each item comes shipped in jewelry box. Each item is designed and handcrafted by our artisans.