5.20 Ct. Ametrine from Ceylon (Sri Lanka)

This specimen is a transparent 5.20 carat oval bi color ametrine, with exact dimensions 13.36 x 9.96 x 6.95 mm, a length to width ratio of approximately 1.34 to 1, and a depth of approximately 59.6 percent, presented in a mixed brilliant cut with an excellent polish, clarity described as very very slightly included evaluated at eye level, color intensity graded as medium, enhancement by heat treatment, origin Ceylon, Sri Lanka, and offered by The Natural Gemstone Company. The mixed brilliant oval form has been executed to precise proportions to balance face up presence and optical performance, yielding a pleasing table and pavilion geometry that supports both strong light return and clear presentation of the bicolor zoning. The stated weight and dimensions are consistent with quartz specific gravity, and the combination of transparency and medium color intensity makes this stone ideally suited for fine jewelry where both color contrast and brilliance are required.

The faceting is a true mixed brilliant treatment, using a brilliant style crown to maximize scintillation and a carefully configured pavilion that moderates reflected light to preserve color separation between the amethyst purple and citrine yellow zones. The lapidary approach favors slightly deeper pavilion angles than a full brilliant in order to provide internal pathways that allow the two hues to sit distinctly when viewed face up, while keeping facet junctions crisp and symmetry within tight tolerances to avoid visual distortion. The oval outline at a 1.34 to 1 ratio produces pleasing optical length, and the carefully controlled depth percentage around 59.6 percent optimizes light return for quartz, limiting windowing and avoiding excessive darkening. The excellent polish is evident in mirror sharp crown facets and smooth girdle finish, promoting high contrast flashes and ideal crown table reflections when set.

Color characteristics are a central value driver for bi color ametrine, and this specimen displays a balanced and clearly readable bifurcation of violet and golden hues, each at medium intensity so that both colors register distinctly under daylight and standard gemological lighting. The color zoning reads as a well defined transition rather than a harsh boundary, which indicates thoughtful orientation by the cutter to favor face up aesthetics, and the medium saturation preserves natural character without appearing overly dark or washed out. Heat treatment has been applied, a common and industry accepted enhancement for quartz, to refine tone and enhance contrast between the amethyst and citrine components while maintaining natural zoning and crystal integrity. The treatment is stable under normal wear conditions and does not mimic artificially induced colors that would compromise origin attribution. Clarity grading at very very slightly included evaluated at eye level indicates that inclusions are minute, localized, and do not detract from transparency or structural integrity, making this gemstone both beautiful and durable in everyday jewelry use.

Provenance from Ceylon, Sri Lanka, contributes a distinct layer of value and desirability, both historically and commercially, because Sri Lanka is globally recognized for producing gems with exceptional clarity and classical trade provenance, and because ametrine material from this region is relatively uncommon compared to the more widely known Bolivian sources, thereby enhancing collectibility and market distinction. The metamorphic terranes of Ceylon impart crystalline qualities that translate into clean facet windows and stable color zoning, attributes that are favored by discerning buyers and designers alike. The Natural Gemstone Company documents origin and treatment status for transparency, and we recommend settings that orient the stone along its long axis to emphasize the color split, with prong or bezel options selected to protect the girdle and maintain face up symmetry. For clients seeking a technical specification sheet or independent certification, we provide gemological documentation on request, and we stand behind the craftsmanship and provenance of this 5.20 carat bi color ametrine as a technically refined, visually compelling, and collectible gemstone.