0.60 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This specimen is a transparent 0.60 carat, round shape blue sapphire, measuring 4.67 x 4.66 x 3.57 mm, cut and finished by skilled craftsmen for optical precision. The cutting style is faceted, executed in a mixed brilliant configuration that pairs a brilliant style crown with a modified pavilion that emphasizes color saturation. Clarity is graded as eye clean at typical viewing distances, and the polish is graded excellent, yielding crisp facet edges and mirror like facet faces. The stone exhibits vivid color intensity, characteristic of high quality Ceylon origin material, and has been heat treated, a stable enhancement widely used to improve color uniformity and to reduce minor silk or rutile inclusions without filling or diffusion. As a corundum variant, this sapphire has a refractive index in the range of approximately 1.76 to 1.77 and distinct pleochroic behavior, showing slightly different blue and violet blue hues depending on orientation, properties that are intentionally considered during cutting to balance hue and saturation across the face up presentation.

The mixed brilliant cut of this round sapphire is engineered to maximize light return while preserving and concentrating color. The brilliant crown with its array of kite and star facets disperses incoming light into a controlled pattern of brilliance and scintillation, creating lively flashes on movement. Beneath the crown, the modified pavilion employs larger step influenced planes that act to trap and concentrate light within the body color, reducing windowing and enhancing perceived saturation. Proportioning is calibrated so that the table dimension and crown height reconcile with the pavilion geometry to promote optimal total internal reflection given corundum s refractive index, thereby minimizing leakage through shallow exits and avoiding excessive extinction from overly deep facets. Precise facet junctions and tight symmetry create consistent contrast patterning, producing stable dark and bright facets that enhance the three dimensional brilliance and contribute to a crisp, deep blue face up appearance. The excellent polish produces low surface scattering, allowing maximum transmission of internal light paths and sharp scintillation points when the gem is moved under spot illumination.

From a craftsmanship and setting perspective, the combination of an eye clean clarity grade and vivid color intensity makes this 0.60 carat Ceylon sapphire particularly versatile for fine jewelry applications. Heat treatment has improved color homogeneity and clarity while maintaining the gem s structural integrity, and the excellent polish and well executed facet geometry ensure both visual performance and ease of setting. For maximum light performance when mounted, settings with an unobstructed pavilion and an open gallery are recommended to allow light entry from the pavilion as well as the crown, and prong or low bezel configurations will preserve the star like scintillation and balanced color. The provenance from Sri Lanka contributes to the stone s characteristic lively cornflower to royal blue tone, and The Natural Sapphire Company is presenting this gem with full disclosure of treatment and origin so that the technical qualities are clear to knowledgeable buyers. For further details on matching proportions, recommended mounting options, or to request additional viewing images under varied lighting, please contact The Natural Sapphire Company and our gem specialists will provide precise measurements and setting recommendations tailored to your design goals.