Gemstone: Natural Blue Sapphire Weight(Carat): 4.25 Weight(Ratti): 4.72 Refractive Index: 1.76 Specific Gravity: 3.99 Shape: Oval Dimensions: 11.4 × 8.1 × 5.4 mm Origin: Madagascar / Ceylon (Sri Lanka) Treatment: Natural (Heat/Unheat can be mentioned if confirmed) Transparency: Transparent Color: Deep Royal Blue Certification: Available on request Usage: Jewelry & Astrology