3.15 Ct. Color Change Sapphire from Ceylon (Sri Lanka)

This listing describes a single, transparent color-change sapphire originating from Ceylon, Sri Lanka, presented by The Natural Sapphire Company. The gemstone weighs 3.15 carats and is fashioned in a cushion shape with a mixed brilliant cut. Its measured dimensions are 8.61 by 6.56 by 5.52 mm, and the cutting proportions deliver a balanced face-up area and depth that contribute to both presence and light performance. The clarity has been graded as very very slightly included, evaluated at eye level, and the polish is excellent. Color intensity is described as intense, and the stone displays a distinct color change under different lighting conditions. No enhancement has been performed on this sapphire, and the untreated origin and natural color behavior are key attributes that inform both market value and collector interest.

The carat weight of 3.15 is central to the valuation and rarity profile of this sapphire, and it warrants specific attention. In corundum, incremental increases in carat weight do not translate to linear adjustments in price, because larger natural crystals that can yield gem-quality material without significant treatment are comparatively uncommon. For color-change sapphires, which require particular combinations of trace elements and crystal chemistry to show distinct shifts in hue, achieving a clean, transparent example above the 3-carat mark is notably less frequent than finding smaller specimens. The 3.15 carat weight, therefore, represents not only a larger physical presence but also a premium in rarity, as the supply of untreated, transparent color change material at this size is limited. From a gemological standpoint, weight works in tandem with the gem proportions to affect face-up dimensions and perceived size. The cushion outline and mixed brilliant facetation of this stone maximize the visible table area while preserving depth for durability and light return, so the 3.15 carat weight is translated effectively into a substantial face-up impression that reads larger to the eye than a flatter stone of similar mass.

Beyond the pure arithmetic of weight, the 3.15 carat size amplifies the desirable optical phenomena associated with this sapphire. Color change in corundum is dependent on specific absorptions, and these effects are more readily observed in stones that are both transparent and of sufficient size to allow the color fields to develop across multiple facets. This sapphire exhibits intense color intensity, and the larger carat weight enhances the drama of the shift between fluorescence-influenced lighting and incandescent lighting. The combination of very very slight inclusions and transparency ensures that light travels through the crystal with minimal obstruction, allowing the mixed brilliant cut to exhibit a strong play of tone and saturation across the crown and pavilion. The excellent polish further supports these optical qualities, as crisp facet junctions and even surfaces reduce light scatter and preserve the integrity of the color change effect. Because no enhancement has been applied, the color behavior and intensity are entirely natural, which is an increasingly important factor for collectors and connoisseurs who prioritize untreated material from established origins.

From a practical and long-term value perspective, a 3.15-carat untreated Ceylon color-change sapphire carries considerations for both design and investment. In jewelry design, this weight and the stone dimensions make it well-suited to function as a center stone in a ring or pendant where the face-up presence is intended to be a focal point. The cushion shape offers a classic yet adaptable silhouette that works with a range of mounting styles without excessive loss of material to re-cutting. For investment-minded purchasers, the combination of size, untreated origin, and natural color change contributes to a scarcity profile that can support premium pricing relative to smaller or treated stones. The clarity grade evaluated at eye level indicates that the very very slight inclusions do not materially detract from the visual appeal or the gem value, while the excellent polish and precise mixed brilliant cutting preserve both brilliance and durability. The depth at 5.52 mm supports structural integrity while allowing the stone to be set securely without undue thinning, which is a consideration for enduring wear.

The Natural Sapphire Company provides this detailed assessment to allow informed decisions based on measurable attributes and gemological context. The 3.15 carat cushion color-change sapphire from Ceylon combines a rare confluence of weight, untreated origin, transparency, and intentional cutting to present a gemstone that is both visually compelling and quantitatively significant in the market for natural sapphires. Potential buyers are encouraged to consider how the carat weight contributes to rarity and value, how the dimensions and cut translate that weight into face-up presence, and how the absence of enhancement preserves the natural character of the color change. Documentation of the grading observations and origin evaluation accompanies the stone, supporting transparency in provenance and quality, and enabling an objective comparison with other sapphires in equivalent size and category.