8.88 Ct. Bi Color Ametrine from Ceylon (Sri Lanka)

This specimen is an exceptional transparent 8.88 carat pear shape bi color ametrine from Ceylon, Sri Lanka, measuring 18.35 x 11.08 x 8.00 mm. The cutter elected a mixed brilliant faceting scheme, combining a brilliant style crown with a tailored pavilion facet arrangement to maximize scintillation and color contrast across the stone. The cut yields a measured depth of approximately 54.4 percent when referenced to the average of the length and width, a proportion that favors a lively return of light while preserving the distinct amethyst and citrine zoning that defines ametrine. Clarity has been assessed at very very slightly included under eye level inspection, which in practical terms renders the gem effectively eye clean, allowing the intense color to remain the dominant visual attribute. The polish is excellent, with crisp facet junctions and mirror like facet planes that enhance surface lustre and internal brilliance. The gem has undergone heat treatment, a routine enhancement to stabilize and intensify hue distribution in quartz, and this treatment has been disclosed in accordance with best practice. The resulting color intensity is classified as intense, producing deep violet and warm golden tones that read vividly in both natural and controlled lighting.

From a setting and customization perspective this pear shaped bi color ametrine is highly versatile, and can be engineered into a wide range of designs while intentionally orienting the bi color axis to achieve different aesthetic outcomes. For a classic engagement or cocktail ring, a tapered V prong at the point is recommended to protect the apex from impact, while four or six prongs on the rounded end maintain balance and symmetry, and a split shank or knife edge gallery will frame the stone without masking the color split. A partial bezel can be used to secure the stone while exposing the pavilion and crown to light, which is useful when the goal is to preserve maximum brilliance and to emphasize the bi color transition, whereas a full bezel will offer superior protection at the cost of slightly reduced light entry. A halo of small brilliant cut accent stones will increase apparent size and intensify perceived brilliance, and contrasting metals can be used within the same design to emphasize either the purple or the golden zone. For pendant applications the pear orientation can be set point up for an elegant drop, or point down for a traditional teardrop silhouette, and a tapered hidden bail or an integrated basket mount will allow the table to receive direct light for optimal color play. Paired earring designs are best executed with matched pears in mirror image orientation, or as asymmetric drops with complementary stones to respect the natural zoning. For bespoke brooches and multi stone compositions the gem functions well as a focal element within a mixed metal framework, or as the central stone in three stone layouts where two side stones are chosen to either blend or contrast the ametrine hues.

Technical considerations for mounting and fabrication should reflect the stone profile and faceting. The mixed brilliant cut crown requires precise seat machining in the setting to align the table plane for even light distribution, and the pavilion depth means that basket height must be calculated to avoid contact with the culet or lower girdle facets. When designing prongs, ensure that the V prong at the apex is formed with a soft interior radius to reduce stress concentrations at the tip, and that prong thickness is calibrated to provide security without obscuring fire. Metal choice will materially affect perceived color, with yellow and rose gold warming the golden zone and subtly counterbalancing the violet, while white gold and platinum will emphasize the cooler violet tones and create greater contrast between the two colors. At The Natural Gemstone Company we can supply professional CAD renderings and wax prototypes to validate how the color zoning reads in a proposed design, we can advise on appropriate accent stone choices that will complement the intense color grade, and we can coordinate mounting with experienced bench jewelers to exacting tolerances. We disclose the heat treatment and provide detailed imagery and measurements for appraisal, and we welcome inquiries for custom commissions, matched pair sourcing, and advice on setting methods that will deliver both aesthetic impact and long term durability.