Notes: This is an incredible untreated large blue cc sapphire. The tone is a nice medium blue and the stone's color is vivid. It does have a strong color shift from a blue in natural light to a violet purple in some artifical light and violet blue in other artifical light. All depending on the sprectrum of light the stone is viewed in. Small silt inclusions that are undetectable by the unaided eye that shows it has no signs of heat. The stone was re-cut to bring out the true beauty of this stone. Stone has been tested no heat by a US lab and includes the certification with purchase. Certification has origin of Ceylon on it.