4.26 Ct. Bi Color Ametrine from Brazil

One beautiful transparent 4.26 carat emerald cut shape bi color ametrine is presented with crisp proportions and measured dimensions of 11.19 by 8.12 by 6.45 mm. The gem is faceted in an emerald cut format, a step cutting style that emphasizes clarity and directional light flow, and it originates from Brazil. The piece has a clarity grade of very very slightly included evaluated at eye level, a medium color intensity rating, and an excellent polish that yields a bright, clean face up appearance. The stone has been heat treated as a stable enhancement to optimize color distribution, a common and controlled practice for ametrine, and The Natural Gemstone Company documents its provenance and treatment history for discerning buyers. This specimen is transparent, with internal characteristics that are minimal and well controlled, allowing for unimpeded light transmission and accurate assessment of hue and tonal contrast.

The cutting execution of this emerald cut ametrine displays technical refinement in facet geometry and symmetry, with long rectangular step facets on the crown and pavilion that create parallel, mirror like flashes rather than scintillating brilliances. The table facet is proportioned to balance windowing and depth, providing a broad plane for the bi color partition to be read clearly, while the crown steps guide light into the pavilion where precise pavilion facet junctions return coordinated flashes to the viewer. The girdle has been finished to a consistent thickness, suitable for secure bezel or prong settings, and the crown and pavilion angles have been calibrated to quartz refractive indices to preserve both saturation and light return. The excellent polish is apparent in the absence of polish lines or pitting, enabling crisp facet junctions and minimal surface diffusion of light. The cutter prioritized orientation of the color zoning to the table plane, thereby exposing the bi color personality with stability under normal wear, and the step cut minimizes the appearance of motion induced color shifts while maximizing the gemster quality expected by collectors.

Color behavior is the defining feature of this bi color ametrine, with a medium intensity that reads as a warm golden citrine yellow set against a complementary secondary tone. The color partitioning is deliberate and visually legible, producing a pleasing contrast without harsh banding, and the transparency of the crystal amplifies the saturation where facets concentrate color. From optical data consistent with quartz family material, expect a refractive index in the range typical for amethyst and citrine specimens, a modest birefringence that does not interfere with the step cut aesthetic, and hardness sufficient for durable everyday jewelry when properly set. The heat treatment applied has been executed to refine hue balance while preserving the stone matrix and internal clarity, rather than to mask inclusions, and the medium intensity grade ensures that metameric shifts under different light sources remain controlled. The facet plan and polish combine to generate even luster and a polished window that presents the bi color partition with clarity, allowing the gem to function as a visual anchor in a design while retaining a cultivated, technical presence for connoisseurs.

The clarity grade of very very slightly included evaluated at eye level denotes that internal features are minimal and at a scale that does not disrupt the overall optical performance of the stone, a quality outcome of careful selection and cutting. This relative flawlessness enhances beauty from every angle by permitting uninterrupted light passage, creating clean step reflections, and allowing color transitions to resolve without scatter or shadowing. For the jeweler this translates into predictable behavior once set, and for the collector this translates into an ametrine whose character is legible in both loupe and unaided inspection. The Natural Gemstone Company offers this gem as a specimen ideal for precision settings that showcase the emerald cut plane, including classic four prong mounts, low profile bezels, and bespoke cocktail rings that depend on symmetrical alignment. Care recommendations include avoiding thermal shocks and abrasive cleaners, and acknowledging that heat treatment has been used to stabilize tone rather than to alter clarity. With documented origin and treatment disclosure provided by The Natural Gemstone Company, this 4.26 carat emerald cut bi color ametrine stands as a technically refined and visually compelling choice for buyers who value measured craftsmanship, optical integrity, and transparent provenance.