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

This exceptional bi color ametrine presents as a transparent, well balanced gemstone measuring 14.79 x 13.61 x 7.66 mm, and weighing 10.93 carat. The cutting style is faceted, executed as an emerald cut with crisp, parallel step facets and gently clipped corners that reinforce the classic octagonal silhouette. The cutter has maintained tight facet junctions and excellent symmetry to emphasize the hall of mirrors effect that step cutting produces, while retaining sufficient table area to display the bi chromatic balance between amethyst purple and citrine golden tones. The polish is graded excellent, which enhances surface luster and allows light to flow uninterrupted across the broad facet planes. Origin is Ceylon Sri Lanka, and the piece has been heat treated to stabilize and intensify tone distribution, a common and controlled enhancement for this material that improves face up color uniformity and overall aesthetic performance.

Coloration is bi chromatic in the traditional ametrine fashion, with clearly perceptible zones of amethyst purple and citrine yellow, evaluated as medium color intensity overall. The cutter optimized facet proportions and pavilion depth to manage color zoning, producing a gentle but discernible transition between the two hues rather than an abrupt line, which creates visual interest and dynamic color shifts as the stone is rotated. Under controlled lighting, the purple displays a clean, slightly bluish amethyst cast, while the golden zone reads a warm, honeyed citrine. Medium intensity affords balanced saturation that reads strongly in larger table presentations such as this 14.79 x 13.61 mm emerald cut, providing both color presence and fine clarity of tone without appearing too dark or overly vivid.

Clarity is graded very very slightly included, evaluated at eye level, which in practical terms means the inclusions are minimal and do not materially interfere with the optical path or brilliance. Under loupe examination the stone reveals tiny feather traces and occasional pinpoint crystals consistent with natural quartz family inclusions, but these are positioned and oriented so as to avoid focal points in the table window. The step cut tends to reveal linear inclusions more readily than brilliant cuts, therefore the cutter placed inclusions in less obtrusive locations and balanced pavilion facet placement to reduce visibility. The excellent polish further mitigates the visual impact of any internal features, ensuring that the gem presents with an open, clean face up appearance that is highly desirable for collectors and connoisseurs who value transparency and technical cutting skill.

Regarding durability, ametrine is a variety of quartz and therefore registers a hardness of 7 on the Mohs scale. This places it comfortably above many softer gem materials and affords reasonable resistance to abrasion and everyday wear. For comparison, diamond is 10 on the Mohs scale and corundum such as sapphire and ruby is 9, while common materials such as topaz are 8. A hardness of 7 means the stone is suitable for daily use in jewelry types that do not expose it to frequent contact with harder materials, and it will withstand most household wear and handling. That said, step cut emerald shapes have elongated corners that can be vulnerable to impact, so we recommend protective settings such as bezel or partial bezel mounts for rings, or well supported prong designs that shield the corners. The excellent polish and heat treatment contribute to surface stability, but standard care to avoid hard knocks, ultrasonic cleaners that may exacerbate existing structural features, and abrasive contact will preserve brilliance and facet integrity.

As offered by The Natural Gemstone Company, this 10.93 carat emerald cut bi color ametrine is a specimen that combines thoughtful lapidary technique with natural gemological interest. The cutter achieved precise facet alignment, careful table sizing, and proportional crown to pavilion relationships to reveal both the color zoning and internal clarity in an elegant presentation. The stone is particularly well suited as a center for a statement ring, a pendant that allows the table to face outward and showcase the bicolor interaction, or a bespoke collectors piece where origin and treatment history are important. We supply full disclosure on origin and heat treatment, and we can advise on mounting options that protect the elongated corners while maximizing visual impact. For clients who appreciate technical craftsmanship and balanced gemological attributes, this Ceylon ametrine represents a refined choice from The Natural Gemstone Company.