This is a  beautiful  hand faceted Alexandrite  set in a Sterling Silver Pendant.  This stone is brilliant blue Or green.  The stone is  is ~10 mm and weighs ~7 carats.  The pendant is packaged with a 18" 1.5mm Figaro Sterling Silver Chain.  This material changes color from shades of blue/purple to shades of green, depending on the frequency of the ambiant light.  The first several images illustrate the change in color in different light.