One of the most sought-after colored gemstones in the world, the color-changing sapphire possesses the rare ability to change color depending on the light. Weighing 12.40 carats, this example of the coveted gem is certified as an untreated color-changing sapphire of Ceylon origin by the American Gemological Laboratories. The captivating, cushion-shaped mixed-cut stone displays a beautiful classic blue color when viewed in daylight and an equally stunning violet hue when viewed in incandescent li