16.57 Ct. Ametrine from Ceylon (Sri Lanka)

This listing describes one transparent 16.57 carat emerald cut bi color ametrine, with dimensions of 19.45 x 14.95 x 7.33 mm, originating from Ceylon Sri Lanka. The gem displays a classic emerald cut, carefully faceted to emphasize the clean color zoning that defines ametrine, and the polish has been graded excellent. Clarity is evaluated as eye clean at eye level, permitting unobstructed light transmission across the broad table and stepped facets. Color intensity is assessed as medium intense, and the piece has undergone heat treatment as an enhancement, a controlled process used to stabilize and refine hue and tone without masking the natural zonation that characterizes ametrine.

Visually the stone presents a yellow central field transitioning to a violet rim, the two hues meeting in a manner that is at once distinct and harmonious. The emerald cut accentuates this transition by creating broad planar facets that reveal layered depth, and the stepped pavilion facets return light evenly to the viewer while preserving the bi color effect. The medium intense yellow reads as a clear citrine like tone, neither muddy nor overly saturated, which allows the adjacent violet to register with clarity. The violet endpoint is cooler and restrained rather than aggressively deep, which produces a balanced contrast with the yellow center. The eye clean clarity contributes to a lucid appearance, enabling internal light paths to play across the zonal interface, and the excellent polish ensures crisp facet junctions and consistent surface luster.

When compared to ametrine material from the well known Anahi mine in Bolivia, this Ceylon example is more tempered in saturation. Classic Anahi ametrine frequently exhibits stronger, more saturated violet that can approach a deep amethyst tone paired with a warm golden yellow, often with very sharp color demarcation. In contrast this Sri Lankan piece favors medium intense tone in both zones, yielding a subtler, more graduated transition that reads as sophisticated rather than dramatic. Compared to Brazilian amethyst from Minas Gerais, which commonly shows a cool, saturated purple with greater depth than the violet band seen here, the violet in this ametrine is lighter and less dominant, allowing the yellow component to occupy the visual center. Against natural citrine from Brazil, which can range from pale lemon to strong orange yellow, the yellow center of this ametrine aligns closest with paler to moderate citrine tones, lacking the strong orangey bias of Madeira style citrines. For buyers accustomed to Sri Lankan corundum, such as Cornflower blue sapphires from Ratnapura, the ametrine’s interplay of yellow and violet represents a different visual language, one based on dichroic zoning rather than the single hue uniformity prized in high quality sapphires. The Natural Gemstone Company presents this stone with full disclosure of its heat treatment and Sri Lankan origin, and the comparative context here is intended to clarify how its hue and tone sit relative to stones from other famous localities, emphasizing the gem’s balanced medium intense color, controlled clarity, and the way its emerald cut amplifies its bi color character.