0.89 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This 0.89 carat round blue sapphire from Ceylon presents as a transparent, intensely colored gem, precisely measured at 5.66 by 5.66 by 3.67 millimeters, yielding a depth percentage of approximately 64.8 percent. The cutter employed a mixed brilliant design, combining a brilliant-style crown with a stepped pavilion to harmonize scintillation with saturated face-up color. The pavilion depth and facet junctions have been calibrated to limit windowing while preserving lively return of blue, and the excellent polish across crown, girdle and pavilion facets enhances the stone’s visual performance. Clarity is graded as very slightly included at eye level, with inclusions that are not disruptive to overall transparency but are diagnostically significant under loupe and magnification.

The inclusions are the sapphire’s unmistakable signature, and they tell a geological and gemological story that appeals to discerning collectors. Fine, oriented needle-like silk threads intersect with minute euhedral mineral crystals and a few angular negative crystals, creating a delicate internal topology. Where these needles intersect near the pavilion, they produce subtle linear flutter and localized light scattering that reads as a faint satin sheen in certain viewing angles, while tiny crystal platelets produce small, high-contrast pinpoints that act as internal reflectors. Together these features create a proprietary pattern of pinwheel and radiating highlights when the stone is rotated under direct light, a distinctive optical fingerprint that is consistent with untreated sapphires from Sri Lanka. These natural inclusions also contribute to the stone’s depth of color by slightly modulating internal light paths, intensifying blue saturation without introducing cloudiness.

At The Natural Sapphire Company we emphasize provenance and natural state; this sapphire is unenhanced, showing no indications of heat, diffusion or clarity treatments, and its polish and facet execution demonstrate careful lapidary work aimed at maximizing both brilliance and natural color. For a connoisseur seeking a compact, intensely hued Ceylon sapphire with a provable natural inclusion pattern and precise cutting proportions, this 0.89 carat mixed brilliant round embodies both gemological integrity and appealing optical character.