1.40 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This 1.40 carat round shape blue sapphire presents a refined balance of size, color, and clarity, measured precisely at 6.63 x 6.66 x 3.92 mm. The stone displays transparent clarity with a grade of very slightly included when evaluated at eye level, and it carries a medium intense blue color that is evenly distributed across the table and crown. The cut is a mixed brilliant, combining facets that maximize light return with an elegant round outline, and the polish has been executed to an excellent standard, yielding crisp facet junctions and a smooth reflective finish. There has been no enhancement applied to this sapphire, and the documented origin is Ceylon, Sri Lanka, a region renowned for producing sapphires with distinctive tone and hue. This description is offered by The Natural Sapphire Company, and it reflects both gemological assessment and the provenance information we maintain for every stone.

The geological story of this sapphire begins millions of years ago, long before the contours of continents familiar to humans took their present form. Sapphires are a variety of the mineral corundum, composed primarily of aluminum oxide, Al2O3, and their formation requires an environment where aluminum is abundant, silica is scarce, and temperatures and pressures are sufficient to drive crystal growth. In Sri Lanka, these conditions were met within high grade metamorphic terranes and within localized zones where aluminum rich rocks underwent extensive recrystallization. Over geologic time scales, layers of sediment and rock were subjected to tectonic burial and regional metamorphism, promoting the mobility of elements and the reorganization of mineral assemblages. Fluids at elevated temperatures facilitated the transport of trace elements and the growth of corundum crystals in veins and pockets within marble and schist, creating isolated environments where large, well formed crystals could develop.

The characteristic blue of this sapphire arose from trace impurities incorporated into the crystal lattice during growth, principally iron and titanium. When iron and titanium are present in close proximity within the corundum structure, a process known as intervalence charge transfer occurs, producing the vivid blue color that distinguishes gem quality sapphires. The medium intense color observed in this specimen indicates a favorable balance of these trace elements, sufficient to create depth without veering into overly dark saturation that obscures brilliance. Over subsequent millions of years, weathering and erosion liberated these gem bearing rocks from their host matrices, and waterways transported the denser corundum crystals into alluvial deposits. In Sri Lanka, such secondary deposits concentrated gem crystals in gravel beds and stream sediments, where they were eventually discovered and recovered through artisanal and industrial gem mining. The crystal that became this 1.40 carat sapphire thus spent a prolonged interval within the dynamic interplay of formation, exposure, and transport, contributing to its rounded outline prior to faceting.

From a gemological perspective, the mixed brilliant cut of this round sapphire is chosen to reconcile pavilion geometry with crown faceting that enhances both scintillation and color saturation. The near equal measurements of 6.63 by 6.66 mm indicate a balanced outline, yielding predictable setting compatibility and optical performance. The depth of 3.92 mm supports the medium intense color without causing excessive light leakage, and the excellent polish ensures minimal surface diffusion of light, preserving contrast and sparkle. Clarity graded as very slightly included to the eye level implies that inclusions are minor and do not materially affect visual appeal or durability, while they may offer valuable indicators of natural formation and origin when examined under magnification. The absence of enhancement is a significant attribute, as unheated sapphires retain their natural lattice state and are often of particular interest to collectors who prioritize untreated material. The Ceylon provenance contributes contextual value, as Sri Lankan stones are historically associated with lively, velvety blues and a reputation for fine quality, attributes that are consistent with the observed medium intense hue and lively transparency of this sapphire.

The Natural Sapphire Company documents and conserves the history and characteristics of each gemstone we offer, and this sapphire is accompanied by our assessment and origin disclosure. For use in a ring, pendant, or other tailored setting, the stone’s round mixed brilliant proportions allow for versatile design approaches, whether set in a minimalist bezel for contemporary restraint or in a classic four prong mount to emphasize light return. Care recommendations for unheated corundum remain straightforward, avoid harsh chemicals and prolonged exposure to high temperatures, and clean with mild soap, water, and a soft brush to maintain luster. The ethical sourcing practices and provenance chain associated with Ceylon gems are part of the documentation we provide, supporting informed decisions by jewelers, designers, and private collectors. This sapphire embodies a concise intersection of geology, craftsmanship, and verified origin, and it is presented with the exacting standards of assessment and reporting upheld by The Natural Sapphire Company.