16.31 Ct. Bi Color Ametrine from Brazil

This exceptional transparent 16.31 carat marquise shape bi color ametrine from Brazil is a vivid demonstration of both natural rarity and masterful cutting, offered with confidence by The Natural Gemstone Company. The specimen measures 20.29 x 16.50 x 10.22 mm, dimensions that give the stone a commanding presence while maintaining wearable proportions for a range of jewelry designs. As a bi color ametrine this gem displays a natural juxtaposition of amethyst purple and citrine yellow within a single crystal, creating a striking color contrast that is inherent to ametrine specimens from its Brazilian deposits. The gem has been heat treated to enhance its color transition stability, a standard and controlled enhancement practiced to accentuate the natural dichroic tendencies without compromising the structural integrity of the crystal. The overall color intensity is classified as intense, which communicates saturation levels that remain strong even under varied lighting conditions, and the transparency is high, allowing for excellent light transmission and color play across the marquise surface.

The cutting style is faceted, executed in a mixed brilliant cut that combines a brilliant style crown with a carefully proportioned lower section to balance fire and brilliance with directional color zoning. The marquise silhouette presents an elongated navette form, with pointed terminations that demand precise facet junctions and symmetry to avoid bowtie phenomena. The cutter has employed a brilliant crown arrangement of small triangular and kite facets to generate scintillation and to animate the bi color interface, while the pavilion incorporates elongated facets designed to return light into the crown and to preserve color integrity along the length of the stone. Attention to pavilion depth and table diameter is evident, contributing to a lively light performance without sacrificing the visual separation between the amethyst and citrine sectors. The polish is excellent, the facet planes are clean and sharp, and the symmetry is executed to industry standards, all of which serve to maximize both brilliance and the perceptible edge definition inherent to marquise cuts.

On the subject of clarity and internal characteristics, this ametrine is eye clean when evaluated at eye level, a clarity assessment that indicates the absence of inclusions visible to the unaided eye under normal viewing conditions. Microscopic inclusions may be present as is typical for natural quartz family gems, and these can act as identification markers confirming natural origin rather than detracting from overall visual appeal. The intense color intensity is distributed in a way that creates a pleasing bi color effect, with a well defined transition plane between the purple and yellow zones that remains balanced across the table when set. Ametrine commonly exhibits pleochroic tendencies, and this piece shows directional color variance that becomes part of its visual character depending on orientation and lighting. The heat treatment applied is intended to refine the color transition and to stabilize hue concentration, the treatment is permanent and does not affect routine wear, and it is disclosed as part of the stone specification by The Natural Gemstone Company.

This marquise bi color ametrine is exceptionally versatile, suitable for both casual and formal settings, and the dimensions plus cutting proportions lend themselves equally to statement rings, elegant pendants, and tailored cocktail pieces. In casual contexts the marquise form elongates and flatters, making it a refined focal point in everyday jewelry that pairs well with both minimalist and artisanal mounting styles. For formal applications the intense color intensity and the mixed brilliant faceting deliver ample fire and scintillation under evening lighting, ensuring presence on the red carpet or in formal receptions. Design considerations include orienting the bi color plane to complement the wearer, selecting prong or bezel settings that protect the pointed ends without obscuring the color transition, and proposing metal choices that enhance the dichroic effect, for instance cooler tones to emphasize the purple sector, or warmer tones to harmonize with the yellow sector. The Natural Gemstone Company provides this ametrine with full specification details, professional imaging guidance, and consultation on setting options, ensuring that the gem integrates seamlessly into bespoke or existing designs while preserving its optical and structural qualities.