1.66 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This transparent 1.66 carat radiant shape blue sapphire measures 7.71 x 5.71 x 4.06 mm, and is presented with a radiant cut that balances step and brilliant faceting to enhance both depth and sparkle. The stone is eye clean when evaluated at eye level, with an intense color intensity and an excellent polish that contributes to crisp facet junctions and strong light return. Origin Ceylon Sri Lanka is noted for producing sapphires with lively, clear blue tones, and this example displays a vivid yet refined blue characteristic of that provenance. The sapphire has been heat treated, a stable and widely accepted enhancement that optimizes color saturation while preserving natural transparency and structural integrity. The combination of precise dimensions, a high quality polish, and well executed radiant faceting makes this gem suitable for a variety of settings where a balance of brilliance and color presence is desired. The Natural Sapphire Company provides this gem with documented origin and treatment information, reflecting our commitment to transparency and gemological accuracy.

When compared to more commonly encountered gemstones, this Ceylon blue sapphire offers a distinct visual performance. Diamonds exhibit high refractive index and dispersion, resulting in pronounced fire and scintillation, whereas corundum, with a refractive index near 1.76 and lower dispersion, produces less spectral fire but delivers strong, even brilliance when cut and polished well. Unlike emeralds, which often show significant inclusions and a softer luster, and rubies, which can present deeper red saturation that absorbs rather than reflects light, this sapphire combines vivid color with excellent clarity to achieve a luminous, almost velvety blue glow. The radiant cut in this piece maximizes facet contrast and scintillation, so the gem appears lively across viewing angles, and the excellent polish ensures efficient light return rather than light leakage. For buyers seeking a gemstone that stands apart through the interplay of intense, pure blue color, eye clean clarity, and a cut engineered for lively appearance rather than purely spectral fire, this sapphire represents a compelling choice, and The Natural Sapphire Company is available to provide further measurements, images, and setting recommendations to ensure the gem performs as intended in finished jewelry.