1.23 Ct. White Zircon from Ceylon (Sri Lanka)

This white zircon presents itself as a precisely measured and technically refined specimen, weighing 1.23 carat, and calibrated to 5.96 x 5.88 x 4.04 mm in a round outline. The cutting style is faceted with a mixed brilliant configuration, combining a brilliant facet arrangement on the crown with optimized pavilion faceting to balance weight retention and optical return. Color intensity is classified as colorless, and clarity is graded as very slightly included, evaluated at eye level, which indicates inclusions that do not materially interrupt the overall transparency or light transmission. The polish is excellent, delivering mirror like facet surfaces that maximize scintillation and maintain crisp facet junctions. Enhancement has been applied by heat treatment, a stable and widely accepted process for zircon that refines tone and removes residual brown or yellow zoning without compromising the integrity of the stone. The provenance is Ceylon Sri Lanka, a historic source renowned for producing clean, high quality zircons, and this specimen has been selected, prepared, and presented by The Natural Gemstone Company.

From a technical optics perspective the mixed brilliant cut for this round zircon is intentional and meticulous. The crown is faceted in a classic brilliant arrangement to fragment incoming light into numerous small flashes, while the pavilion has been modified with carefully angled facets to manage the high refractive properties of zircon. Zircon characteristically exhibits a relatively high refractive index and appreciable dispersion, which translates into pronounced brilliance and fire when the cutter aligns the optical axis with the stone orientation. In practice this means that the cutter prioritized facet proportions that enhance return of white light without sacrificing spectral color play, a task that demands tight control over crown angle, pavilion depth, and table diameter. The dimensions recorded at 5.96 x 5.88 x 4.04 mm reveal a slightly shallower depth ratio optimized to preserve carat weight while maintaining a face up diameter that reads larger than its weight alone might suggest, an important consideration for jewelry design and appraisal.

The lapidary craftsmanship behind this piece reflects a chain of decisions driven by material science and practical lapidary technique. Raw crystals from alluvial deposits in Ceylon are first cleaned and evaluated for inclusions, zoning, and optimum cutting orientation. Zircon often exhibits strong crystal faces and cleavage planes that require cautious preforming to avoid chipping and to orient the optic axis for minimal birefringence effects. In this case the cutter oriented the rough to present a face up round outline, then executed a mixed brilliant scheme that combines a proportionally broad table with well defined crown facets, and a pavilion cut that captures the zircon s intrinsic light return. Pre polish inspection included measurement of facet symmetry to within tight tolerances, then final polishing on finest laps to achieve the excellent polish grade. Heat treatment was applied in a controlled kiln, following industry best practice for temperature ramps and soak durations, to stabilize color without inducing strain or surface iridescence. Each step was documented and verified by experienced graders, ensuring the finished gem meets the technical expectations of precise facet junctions, low windowing, and lively scintillation.

For designers and technically minded clients this white zircon is recommended for settings that both showcase its optical performance and protect its integrity, given zircon s moderate hardness relative to corundum and diamond. A bezel or protective halo can secure the stone while allowing the mixed brilliant crown to interact with light, and an open pavilion mounting can be used when the design accommodates it to permit maximum light entrance. The clarity evaluation of very slightly included at eye level supports clean presentation in solitaire settings, but the inclusion map will be provided on request for exact orientation during setting. The Natural Gemstone Company maintains full disclosure of the heat treatment and provenance, and can supply imagery and additional measurements including precise table and crown percentages upon request. For buyers who appreciate the interplay of material properties and cutting technique this zircon offers a demonstrable study in how informed lapidary choices unlock the natural optical assets of Ceylon material, delivering a stone that measures precisely, performs predictably, and carries a clear recorded history from mine to market.