A 5-carat alexandrite weighs approximately 1 gms (0.9 gms for ratti) and is among the most valuable of all the world's stones, belonging to the family of Chrysoberyl that has a distinct color-changing property. They appear like a green emerald stone during the day and turn into a red ruby gem by night. Read More:- https://www.navratan.com/categ....ories/5-carat-alexan