Stunning 14K Yellow Gold Lab Created Alexandrite Color Changing Ring Sz7.25 4.3g. This ring changes color swiftly to blue under natural day light, and to purple in a dark room. You can see them clearly in the pictures, absolutely amazing. The stone is 11mm round cut (4.9ct). The face of the ring measures 19mm in diameter. The band is near 2mm wide. Maker’s hallmark was marked inside the band, also passed 14k acid test. In excellent condition! Thanks for looking!