10.91 Ct. Bi Color Ametrine from Madagascar

One beautiful transparent 10.91 carat cushion shape bi color ametrine is presented with precise proportions, 13.96 x 13.62 x 9.71 mm, a mixed brilliant cut, and a clarity grade of eye clean evaluated at eye level, intense color intensity, and an excellent polish. The crown and pavilion are executed to balance dispersion and color separation, with a mixed brilliant schema that combines the optical return of circular brilliant facets on the crown with step influenced pavilion facets to harness the dual color zones. The cutter retained a slightly elevated crown profile and a measured pavilion depth to optimize light return and scintillation while preserving the integrity of the bi color interface. Enhancement is heat treated, a stable and commonly applied treatment in quartz gemology to enhance and stabilize the citrine and amethyst tonalities, and the material is securely traced to Madagascar provenance, a source that yields specimens with pronounced color zoning and robust sizes suitable for statement pieces.

From a faceting and optical performance perspective, the mixed brilliant cut on this cushion ametrine is a deliberate technical choice to balance contrast and brilliance, the crown facet arrangement increases the contribution of specular highlights, while the pavilion facets control the internal light pathways to accentuate the subtle boundary between citrine and amethyst color domains. The bi color transition is clear and well distributed, with a warm golden amber field that transitions to a deep wine to violet field depending on viewing angle and illumination, a behavior consistent with differential iron valence and selective irradiation effects in natural quartz. The intense color intensity rating denotes saturation that remains vivid with minimal light wash at standard jewelry viewing distances, and the high degree of polish across table, crown, and pavilion facets produces crisp facet junctions and mirror like facet planes that enhance both face up brilliance and lively facet contrast.

Clarity and durability are central to the gemological appeal of this piece, eye clean clarity evaluated at typical viewing distance ensures the stone reads clean in mounted jewelry, and the absence of surface reaching fractures or large inclusions allows the cutter to exploit the full potential of the mixed brilliant layout. Heat treatment has been applied to refine and unify the citrine tone without compromising the crystalline integrity of quartz, the material retains a Mohs hardness near 7 which supports everyday wear with appropriate protective setting choices. The gem sits within dimensions that facilitate a dramatic presence on the finger or as a pendant focal, the cushion form and slightly rounded corners offer both an elegant silhouette and mechanical resilience, and recommended settings include a low profile prong design to display the color split, or a hybrid bezel with open gallery to protect the girdle while allowing light to interact with the pavilion facets.

Beyond the technical narrative, this ametrine carries a romantic provenance tied to its dual hues and crystalline clarity, the golden citrine portion embodies the memory of sunlit harvest fields, a soft radiance that evokes the promise of abundance and warmth, while the amethyst zone recalls the violet hush of twilight, a contemplative and protective hue that has long been associated with serenity and fidelity. Together the two colors form a visual allegory of two lovers who meet at the edge of day and night, each retaining distinct character yet forming a continuous plane of color where they touch, the eye clean clarity acts as a metaphor for unclouded trust, allowing stories and reflections to pass through without distortion. For a wearer this stone can symbolize the seamless transition from laughter to quiet conversation, the capacity to hold both warmth and depth in a single partnership, an heirloom ready to carry narrative across generations.

The Natural Gemstone Company is pleased to present this Madagascar ametrine as an exemplar of thoughtful cutting and responsible sourcing, we can provide supplementary high resolution images, spectral documentation upon request, and consultation on custom mounting to ensure the stone is oriented to maximize its bi color interplay. For care we recommend cleaning with warm water, mild detergent, and a soft brush, avoid abrupt temperature changes and aggressive chemical exposure, professional ultrasonic or steam cleaning is not advised after heat enhancement unless clearance is provided by a qualified lapidary. If you seek a center stone that blends technical refinement with poetic symbolism, this 10.91 carat cushion bi color ametrine offers both, please contact The Natural Gemstone Company for availability, certification options, and bespoke setting services.