Natural Blue Sapphire - Heated (With ZGL Certificate) Carat Weight: 3.55 ct Color Grade: Midnight Blue / Deep Indigo Shape / Cut: Round - Mixed Dimensions: 9.44 x 9.48 x 4.83 mm Tone & Saturation: Very Dark / Highly Saturated Internal Characteristics: Natural growth features, fine silk/clouds, and color zoning visible under magnification We also make custom 925 silver rings for reasonable price. Call for more details.