Synthetic Alexandrite is far from the cost per carat of a natural Alexandrite, but among synthetic gems it is one of the most valuable. Our Simulated Color Change Alexandrite, the stones show greenish blue or bluish green in normal lighting. They become purplish pink under direct sunlight or flashlight. The Celtic knots in our sterling silver rings are taken from Ireland’s national treasure; the book of Kells Silvershake Simulated Color Change Alexandrite White Gold Plated 925 Sterling Silver Celtic Knot Ring, is shipped with anti-tarnish protection in reinforced gift boxes & satin-style pouches; guarantee far-outlasting competitors Synthetic Alexandrite Color-Change gems possess the same properties as natural gems; they only differ in that they are grown in a controlled environment Silvershake Simulated Color Change Alexandrite White Gold Plated 925 Sterling Silver Celtic Knot Ring Size 10