0.81 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This 0.81 carat transparent blue sapphire from Ceylon combines classical proportions with precise lapidary execution, making it a compelling choice for collectors and fine jewelry designers. The gem measures 6.35 by 4.43 by 2.53 millimeters, yielding a length to width ratio of approximately 1.43 to 1, and a depth percentage near 47 percent when calculated against the mean of the length and width. Cut into an emerald shape with a faceted step style, the stone presents a large rectangular table bounded by parallel crown steps and elongated pavilion facets that provide a restrained hall of mirrors effect, characteristic of well executed step cutting. The piece is transparent with medium color intensity, exhibiting a true Ceylon blue that is neither overly saturated nor washed out, and its surface is finished to an excellent polish that maximizes light return without compromising the crispness of facet junctions. The Natural Sapphire Company stands behind the provenance and craftsmanship of this gem, noting that it has undergone routine heat enhancement common to sapphires from this origin, a treatment applied to stabilize and slightly deepen the blue tone while preserving the stone s natural crystal structure.

Technically, the emerald cut employed here accentuates the sapphire s clarity and color homogeneity rather than promoting scintillation as a brilliant cut would. The step facet arrangement creates broad, parallel facet planes that emphasize internal features and color zones, so the lapidary s decisions about table size and crown angle were made with the intent to balance face up color and optical depth. The table is proportioned to allow even color distribution across the face while the crown step widths and angles minimize light leakage along the length of the stone. The pavilion steps are calibrated to the stone s 2.53 millimeter depth to maintain even tone and to prevent windowing. Because step cuts rely on reflective planes more than small scintillation flashes, the medium color intensity is advantageous, producing a consistent blue that reads clearly at a range of viewing angles while retaining a degree of liveliness. The excellent polish enhances the step planes, yielding sharp facet outlines and clean light return, important attributes when mounting in open settings that reveal the gem s full rectangular profile.

Inclusions within this sapphire are described as very slightly included when evaluated at eye level, and those internal features should be read as unique identifiers rather than flaws to be masked. Typical Ceylon sapphires show fine, oriented needlelike inclusions known as silk, along with isolated mineral crystals and occasional subtle growth zoning, and those characteristics can appear as delicate lineation or soft veiling under magnification. In this stone the inclusions are sparse and fine, contributing minor internal texture that confirms natural formation and origin, while remaining unobtrusive to the naked eye due to the controlled facet geometry of the emerald cut. From a gemological perspective, these inclusions serve as a fingerprint that can be documented for identification, matching, and insurance purposes, and they help distinguish natural material from synthetic or glass filled simulants. Heat treatment, which has been applied to this sapphire, is a stable enhancement that commonly modifies the appearance of trace element distribution and can reduce the visual prominence of rutile silk, yet it does not erase the intrinsic inclusion pattern that provides long term identification markers for conservators and collectors.

Practical considerations for setting and conservation derive directly from the stone s proportions and cutting style. The moderate depth and rectangular profile make the sapphire well suited to both bezel and four prong settings, and the step cut reads exceptionally well in low profile designs where the table is displayed facing outward, and in three stone or halo arrangements where the emerald geometry complements trapezoid or baguette side stones. Because step cuts expose more of the interior than brilliant cuts, care in choosing protective mounting styles is warranted for everyday wear, and a secure bezel or a low protective gallery can preserve the sharp facet edges and preserve the excellent polish. The Natural Sapphire Company offers in house documentation and photography that capture the stone s inclusion map and color characteristics, and we can provide detailed imaging and matching services for clients seeking calibrated pairs or bespoke settings. If you require additional technical data, such as specific facet dimensions, refractive behavior, or a formal gemological report, we can arrange further analysis and certification to support appraisal and design integration.