8.63 Ct. Ametrine from Ceylon (Sri Lanka)

One beautiful transparent 8.63 carat oval shape bi color ametrine from Ceylon Sri Lanka, dimensions 15.17 by 12.00 by 7.98 mm, displays the classic duality of amethyst and citrine within a single crystal, medium color intensity, and a clarity grade of very very slightly included when viewed at eye level. The gem is fashioned in a mixed brilliant cut, combining a brilliant style crown with a faceted pavilion and precise step influenced girdle control to maximize scintillation and color separation. The table and crown proportions have been optimized to balance light return and color contrast, the length to width ratio is approximately 1.26 which preserves an elegant oval outline for a variety of mounting styles, and the excellent polish yields crisp facet junctions and high surface luster. Heat treated for stability and color enhancement, the stone exhibits clean interface lines between the amethyst and citrine zones, and mild pleochroism that responds to orientation, allowing a jeweler to selectively display either hue or emphasize the bicolor transition depending on the setting. The cut exhibits controlled pavilion depth and symmetrical facet alignment to minimize windowing and to retain visual weight, making this ametrine a technically refined centerpiece suitable for collectors and designers who appreciate engineered optical performance.

As a design element this 8.63 carat ametrine adapts to a wide range of custom settings, The Natural Gemstone Company recommends consideration of axis orientation to leverage the bicolor band, setting the long axis vertical in pendants and solitaire rings to present the two tones sequentially, or horizontally for an east west ring to create a striking color bar effect. A low bezel or open gallery will protect the gem while permitting light to traverse both color zones, prong settings with four or six points will maximize light return and sparkle, and a halo of small diamonds will intensify the perceived color contrast and add fire without obscuring the bicolor line. Three stone and custom split shank designs can flank the ametrine with matching citrine and amethyst accents, or with tapered trapeze side stones to emphasize the oval silhouette. For high durability applications consider a secure bezel or partial bezel with reinforced claws, communicate the heat treatment to the bench jeweler for any soldering or finishing steps, and request CAD renderings and viewing angles to finalize orientation. The Natural Gemstone Company offers consultation on mounting recommendations, bespoke design services, and technical certificates to ensure the final piece highlights the gemology and craftsmanship of this exceptional bi color ametrine.