The purity of its forms, richness of color, and crystal cleanness are the main features of this unheated, Ceylon blue sapphire, which was mined in the Kuruvita gem fields and cut and polished in Ratnapura, Sri Lanka. A most beautiful sapphire that spells perfection from every facet. It's a great price; this will work well in any setting. It is certified unheated by the CSL (Colored Stone Laboratory, Ratnapura, Sri Lanka).