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

This radiant shaped, bi color ametrine weighing 5.17 carats and measuring 12.57 x 11.38 x 5.66 mm exemplifies precision cutting and optical planning, executed in a faceted, fantasy three dimensional cut that maximizes light return. The geometric faceting pattern combines multiple pavilion facets with a stepped crown geometry to create internal reflections that enhance both brilliance and color zoning, allowing the lemon yellow and soft amethyst tones to shift subtly as the stone moves. The fantasy cut amplifies scintillation by introducing additional light pathways, so that each facet junction acts as a mirror for adjacent tones, producing a lively play of light even with a light color intensity. With an excellent polish and an eye clean clarity grade evaluated at eye level, this ametrine presents minimal visual distractions, permitting the geometric faceting to do the work of revealing depth and color separation. The stone has been heat treated, a customary enhancement to improve color uniformity, and originates from Ceylon, Sri Lanka, which contributes provenance and traceable supply chain value.

For the educated buyer, the combination of a radiant outline, precise fantasy faceting, and transparent material delivers a gem that is both visually compelling and technically sound. The eye clean clarity grade significantly increases lapidary potential for fine jewelry, as inclusions that could interrupt light paths are absent at normal viewing distances, and the excellent polish optimizes light transmission and return. The documented heat treatment is routine for quartz family gems and should be considered a disclosed enhancement rather than a detractor, especially given the stable nature of quartz with a Mohs hardness of seven. Origin from Ceylon, Sri Lanka adds interest for collectors who value provenance, and the 5.17 carat weight in this size range is unusually wearable for a statement ring or pendant when set to showcase its bi color character. The Natural Gemstone Company offers this specimen with transparent grading notes and condition details, and we recommend professional mounting and optional certification for buyers seeking formal documentation to accompany this precisely cut and attractively presented ametrine.