2.58 Ct. Bluish Green Sapphire from Tanzania

This transparent bluish green sapphire presents as an emerald cut weighing 2.58 carats, with exact dimensions of 8.80 by 6.82 by 4.02 millimeters, sourced from Tanzania, and offered by The Natural Sapphire Company. The clarity is graded very slightly included, evaluated at eye level, indicating internal characteristics that are minimal and do not materially impair transparency or overall visual appeal. The stone shows a dark color intensity, which coupled with its transparent body, produces a rich bluish green tone that reads deeper in face up views and reveals subtle blue green pleochroic behavior at oblique angles. No enhancement has been applied to the gem, meaning the color and clarity are wholly natural, a factor that significantly elevates rarity and market preference for collectors and connoisseurs who prioritize untreated material. The combination of 2.58 carats and untreated natural origin is a central determinant of value, because corundum of this weight and authentic color without treatment is uncommon compared with smaller fragments or heat treated stones.

From a lapidary and gemological perspective the emerald cut, executed as a step cut with a broad rectangular table and truncated corners, emphasizes color saturation and clarity rather than scintillation. The proportions of this example produce a length to width ratio of approximately 1.29, giving an elegant rectangular silhouette that works well in both classic and contemporary settings. The measured depth relative to the average of length and width yields a depth of roughly fifty one point five percent, a proportion that balances face up spread with sufficient pavilion volume to enhance color saturation without overly deep body color. The step facets form parallel terraces that create large planes of color, which in a dark bluish green sapphire will often present as bands or windows of richer and slightly lighter hue depending on viewing angle and lighting spectrum. Excellent polish across all facets and crisp facet junctions indicate skilled cutting, minimizing surface diffusion and maximizing clean light return for the step cut geometry. Inclusions are sparse and small, consistent with the very slightly included grading, and because they are contained and aligned with the step facet orientation they are visually unobtrusive, particularly in mounted scenarios.

Weight is a primary driver of both rarity and price in corundum, and the 2.58 carat mass of this sapphire is a defining attribute. Sapphires increase in rarity and desirability non linear with size, because attaining a clean, well colored stone above two carats requires larger pieces of rough and more careful cutting yield, which are less common in most deposits. The Tanzanian provenance adds another layer of market interest, as regional geochemistry influences trace element profiles that produce distinctive bluish green tones that can be difficult to match. For practical use and longevity, the emerald cut shape permits secure setting options that protect the truncated corners, for example four or six prong designs with corner guards or a bezel with chamfered corners, which maintain the clean step facet planes while reducing exposure to impact. For color presentation, a cooler white metal will enhance the blue notes while a warmer metal will emphasize green nuance, enabling bespoke design choices depending on aesthetic intent. The Natural Sapphire Company can provide detailed certification and setting recommendations, and the untreated status, precise dimensions, clarity assessment, dark color intensity, and especially the 2.58 carat weight combine to make this sapphire a technically interesting and rare specimen, appealing to buyers who value the interplay of cut, proportion, natural color, and provenance in premium corundum.