2.89 Ct. Blue Sapphire from Australia

This parcel presents one transparent 2.89 carat marquise sapphire, a long and elegant centre stone ideally suited to bespoke commissions. The stone measures 14.13 millimetres in length, 6.34 millimetres in width, and 4.10 millimetres in depth, producing a length to width ratio of approximately 2.23 to 1, a proportion that emphasizes elongation while maintaining practical setting geometry for rings, pendants, and drop earrings. Using the standard industry convention of depth relative to average diameter, the overall depth calculates to approximately 40 percent, a proportion that influences both light return and the perceived saturation across the stone surface. At 2.89 carats this marquise occupies a sweet spot between presence and manageability, large enough to read as a dominant centre stone on the finger, yet narrow enough to sit comfortably within classic or contemporary head designs without requiring excessive metal. The dimensions make this sapphire particularly adaptable to east west or north south orientations, and the measured proportions simplify matching for multi stone layouts where predictable length and width are required.

The cutting style is a mixed brilliant, combining a brilliant facet schema on the crown with a disciplined pavilion architecture designed to optimize internal light dynamics for an elongated outline. This blended approach preserves scintillation at the crown facets while allowing pavilion planes to control color concentration, a desirable quality in sapphires with dark color intensity. The polish on this example is excellent, resulting in crisp facet junctions and a clean facet finish that maximizes specular reflections. Color grading identifies a dark color intensity in a saturated blue hue typical of Australian material, with uniformity across the table and keel that avoids patchy zoning under standard lighting. The stone has been heat treated, a standard and stable enhancement in sapphire trade practice, applied to improve hue saturation and reduce the visual impact of subordinate inclusions, while preserving the natural crystal habit and overall stability of the corundum matrix. Origin is Australia, which for many designers and collectors signals a darker, more inky blue character that performs exceptionally well in contrast with both warm and cool mounting metals.

Clarity has been evaluated at eye level as very slightly included, a practical designation indicating minor inclusions that do not detract from face up appearance or light return in normal viewing. Under magnification the stone shows small internal features consistent with natural growth, however they are not positioned or sized to compromise the optics or structural integrity when the gem is set using appropriate mounting techniques. The corundum hardness of nine on the Mohs scale ensures overall durability for everyday wear, yet the marquise silhouette concentrates risk at the pointed ends, therefore we recommend protective settings for ring applications, such as tapered prongs or partial bezel work, to guard against impact on the tips. The mixed brilliant faceting minimizes windowing, by balancing the crown crown brilliance against pavilion depth, and the excellent polish reduces surface scatter that can obscure color, this combination yields a rich face up blue that responds well to both diffuse and directional light.

For custom jewellery the geometry and optical profile of this marquise sapphire make it exceptionally versatile, the 14.13 millimetre length reads as a strong design statement in solitaire rings and pendants, while the narrow 6.34 millimetre width integrates cleanly into three stone compositions or tapered shoulder designs. The elongated ratio enhances perceived finger length when set vertically, and the stone also translates into elegant horizontal settings for modern motifs, with the mixed brilliant cut preserving scintillation in either orientation. Designers will appreciate the way the dark, even saturation pairs with high contrast treatments, for example platinum or white gold to emphasize cool tones, or yellow gold to introduce contrast warmth and increase apparent depth. Practical considerations for bespoke mounting include reinforcing the pointed ends, specifying seat geometry to match the stone pavilion and girdle, and selecting open or closed backs depending on desired color intensity under view. The Natural Sapphire Company is available to advise on setting geometry, metal choice, and accompanying side stones, we can provide CAD mockups and prototyping to ensure the marquise integrates precisely into your intended design, and we welcome enquiries for bespoke commissions.