4.86 Ct. Greyish Blue Rough Sapphire from Ceylon (Sri Lanka)

One translucent rough sapphire, weighing 4.86 carats, presents as a greyish blue specimen with dimensions of 14.20 by 7.00 by 5.20 millimeters. The stone is described as rough in overall shape, with no formal faceting recorded, and a cut designation of not applicable. Clarity is graded included, evaluated at eye level, and the crystal displays visible internal features that include linear zoning and localized mineral inclusions. Color intensity is medium, with a subtle balance between blue and cool grey tones that is characteristic of certain Ceylon material. The surface condition is notable for excellent polish on natural terminations and detachment planes, indicating careful handling and preparation at source. Enhancement is none, validating that the material is in its natural state, and the origin is Ceylon Sri Lanka, a provenance that often yields sapphires with delicate tonal range and fine crystalline structure. These baseline measurements and attributes provide a clear technical foundation for lapidary planning and bespoke setting design.

From a cutting and yield perspective, the elongated profile of this rough crystal strongly informs potential faceting strategies. The 14.20 millimeter length and narrow width favor elongated shapes such as oval, marquise, or elongated cushion, or advanced step cuts such as tapered baguette or modified emerald style faceting if retention of weight is prioritized. Given the included clarity at eye level and the presence of linear zoning, a cutter may elect to orient the pavilion to minimize the appearance of dominant inclusions, or to utilize a mixed cut approach that combines a faceted crown for light return with a shallow step pavilion to preserve carat weight. Expected polished weight retention for material of this shape and inclusion pattern can vary, but careful preforming and minimal aggressive removal could result in a polished yield in the range of approximately 40 to 60 percent, depending on the final shape selected and the decision to expose or mask specific inclusion clusters. The excellent polish already present on termination faces suggests that a lapidary can work from existing natural planes to optimize facet junctions and table proportions, reducing mechanical stress during cutting and improving surface finish on the final gem.

For custom jewelry applications, the dimensions and translucent character of this sapphire make it highly versatile, particularly in bespoke pieces that emphasize the natural aesthetic of untreated material. The elongated form is well suited to designs that capitalize on linearity, including east west set pendants and horizontally oriented rings or bar style earrings, where the length accentuates finger or neck lines. In ring applications, a bezel or partial bezel setting is recommended to protect included areas and terminations, while an open back or low profile gallery will maximize transmission of light through the stone, enhancing the medium color intensity without requiring enhancement. For clients seeking a faceted finished gem, consideration should be given to introducing a modest table size to control face up color, and to adopting pavilion angles that favor return of blue tones rather than exposing grey undertones. The durability of corundum with a hardness ranking of 9 supports everyday wear, however localized inclusions and cleavage planes should be respected during setting, with shock absorbing mounting techniques advised for rings and bracelets.

At The Natural Sapphire Company we emphasize provenance and craftsmanship, and this Ceylon sapphire offers both an authentic untreated origin and the technical qualities that appeal to high level bespoke commissions. The natural greyish blue hue and translucent body allow designers and lapidaries to exercise creative latitude, either by preserving the rough silhouette for an organic, artisan look, or by converting the material into an elegant faceted gem that retains significant carat weight. For collectors and clients who prioritize untreated material, the absence of enhancement is an important attribute that informs valuation and long term desirability. We encourage a consultation to review lapidary sketches, estimated yield, and setting options so that the final piece harmonizes the stone geometry, inclusion architecture, and desired visual outcome. Detailed imagery and measurements are available to support design decisions, and our in house team can coordinate cutting recommendations and bespoke mounting proposals tailored to the technical characteristics of this 4.86 carat Ceylon sapphire.