4.00 Ct. Purple Sapphire from Ceylon (Sri Lanka)

This transparent 4.00 carat oval purple sapphire measures 10.45 by 7.53 by 5.83 millimeters and originates from Ceylon, Sri Lanka. The gem is presented in an oval outline with a length-to-width ratio of approximately 1.39, a proportion that balances presence and wearability. Its overall depth is approximately 65 percent of its average diameter, a measured profile that supports strong light return without sacrificing face-up area. The sapphire displays vivid color intensity and an excellent polish, and it has been evaluated as very slightly included at eye level, indicating inclusions that are minor and do not materially affect transparency. There has been no enhancement applied to this stone, and its natural state and provenance are documented by The Natural Sapphire Company.

The mixed brilliant cut employed on this sapphire is a deliberate synthesis of faceting philosophies, combining the scintillation and light dispersion strengths of a brilliant facet arrangement on the crown with the directional light control of modified pavilion facets. On the crown, smaller, well-proportioned star and kite facets break incoming light into multiple rays that refract through the crown and interact with the pavilion. The pavilion’s faceting has been oriented and angled to capture these refracted rays and reflect them back through the table and crown, maximizing brilliance and dynamic scintillation. Because corundum has a relatively high refractive index, this coordinated interplay of crown and pavilion facets is particularly effective; precise facet junctions and angles determine whether light is returned to the viewer or lost through the base. In this example the facet geometry encourages internal reflection and measured dispersion while maintaining controlled contrast so that the purple hue reads as vivid rather than dark or muted.

The oval outline further influences how light behaves within the stone. Oval shapes can produce an elongated path for light that, if not balanced, creates uneven dark areas commonly referred to as a bow-tie. The dimensions and mixed brilliant faceting in this sapphire mitigate that effect by distributing pavilion and crown facets to channel light consistently across the table. The result is a lively face-up appearance with even color saturation and distributed sparkle. The mixed brilliant approach also moderates the trade-offs between color and brightness: the crown’s multi-faceted surface permits lively reflections and flashes of light, while the pavilion’s calculated facets preserve and concentrate the vivid purple saturation. From practical viewpoints, this produces a stone that reads with immediate visual depth and liveliness when set, while retaining the natural, saturated color that identifies its Ceylon origin.

Clarity and finish are important partners to cut when evaluating optical performance. The very slightly included clarity grade, assessed at eye level, affirms that inclusions are present but do not interrupt the passage of light in a manner that reduces brilliance or transparency. The excellent polish further enhances facet definition, ensuring crisp facet junctions and minimal light leakage at the surface. Together these attributes promote clean internal reflection and strong surface flashes, so the sapphire exhibits a balanced interplay of brilliance, scintillation, and color depth. As an untreated Ceylon sapphire, it retains natural color distribution and character, making it suitable as a focal gemstone in hand-held jewellery or heirloom designs where optical performance and provenance are valued. The Natural Sapphire Company provides this stone with detailed specification and visual assessment so that its cut, clarity, and provenance can be considered in concert when selecting a setting or commissioning a bespoke piece.