1.77 Ct. Blue Sapphire from Ceylon (Sri Lanka)

One beautiful transparent 1.77 carat emerald cut blue sapphire, dimensions 7.27 x 5.36 x 4.27 mm, vivid color intensity, eye clean clarity evaluated at eye level, excellent polish, origin Ceylon Sri Lanka, enhancement heat treated. The gem presents a classic emerald cut outline with truncated corners and a rectilinear silhouette, the proportions calibrated to balance table size and pavilion depth for optimal light return. Weight and dimensions place this stone in a size class that reads larger on the finger than a round gem of equivalent carat weight, due to the elongated spread and large table plane inherent to the emerald cut. Transparency is notable, allowing unimpeded transmission of the sapphire s intrinsic hue, and the vivid color intensity suggests saturated chromium and iron trace element chemistry consistent with high quality Ceylon material. The surface finish is described as excellent polish, with facet junctions rendered to mirror crispness, supporting high contrast reflections and controlled scintillation across the crown and pavilion planes.

The geometric faceting strategy employed emphasizes long step facets on both crown and pavilion, creating planar mirrors that generate broad flashes of saturated blue as the stone is rotated. Emerald cut geometry in corundum relies on a sequence of parallel, truncated steps to channel light into repeatable internal reflections, and this sapphire s faceter has optimized the breadth and angle of those steps to minimize windows and light leakage, and to encourage deep color saturation rather than dispersive rainbow flashes. Crown facets flow from a substantial table through concentric bezel facets, while the pavilion steps are arranged to align optical axes and preserve symmetry, this alignment maximizes evanescent light play and produces extended flashes rather than chaotic pinfire, the result is a controlled interplay between brightness and color that reads as a vivid, velvety blue. From a gemological perspective the design takes into account corundum s refractive index near 1.76 1.77 and the relatively low dispersion, therefore facet angles are tuned to favor color retention and strong internal reflections over excessive fire, the effect is an emerald cut that achieves maximum perceived depth and dynamic light performance for this color grade.

Craftsmanship is evident in the precise faceting, the even girdle, and the absence of visible clarity interruptions at normal viewing distances, these attributes make the stone an excellent candidate for high quality jewelry settings. For mounting recommendations, a four prong setting that secures the corners will preserve the stone s geometry and allow unobstructed light entry through the crown, while a low profile bezel can be used when protection is prioritized, however bezel mounting may reduce perceived brightness by limiting crown exposure. Orientation in a setting can be used to exploit pleochroic behavior in sapphire, presenting the most saturated blue axis to the viewer when set face up, and the faceting symmetry permits predictable optical response under standard viewing angles. Heat treatment has been applied to stabilize and enhance color, a standard and accepted practice for Ceylon sapphires, this treatment is stable under normal wear conditions and is disclosed, The Natural Sapphire Company stands behind the treatment disclosure and can provide certification details upon request. For care we recommend regular cleaning with warm soapy water and a soft brush, professional inspection of the mounting periodically, and consultation with our gem specialists regarding ultrasonic or steam cleaning when the stone is mounted, The Natural Sapphire Company can assist with bespoke settings and technical guidance to ensure the cutter s intention for maximum light play is retained in the finished piece.