With the skyrocketing natural, no-heat sapphire prices in the last decade, this unheated Ceylon blue, hailing from the gem fields of Kuruvita, Sri Lanka, will surely make somebody proud of the find. A very well cut, thoroughly no-heat, Ceylon blue sapphire with some color shift to purplish-bluish color in incandescent light. It's a charming color in daylight. It has been certified unheated by the CSL (Colored Stone Laboratory, Ratnapura, Sri Lanka).