5.67 Ct. Greenish Blue Sapphire from Madagascar

This transparent 5.67 carat emerald cut greenish blue sapphire, presented by The Natural Sapphire Company, combines a rare combination of size and color intensity, suitable for collectors and bespoke jewelry commissions. The piece measures 9.35 x 8.19 x 7.01 millimeters, and exhibits an emerald cut with crisp step facets and truncated corners that emphasize planar symmetry and a refined hall of mirrors effect. Clarity has been evaluated as eye clean at eye level, which is particularly desirable in an emerald cut because the large table and linear facets reveal internal features more readily than brilliant cuts. The color is characterized as greenish blue with vivid intensity, and the surface shows an excellent polish, giving strong satiny luster and sharp facet junctions. The sapphire is heat treated, a stable and widely accepted enhancement that enhances tone and saturation while preserving the stone structure, and the gem is sourced from Madagascar, a locale known for producing a spectrum of blue to teal corundum with notable color variability.

The emerald cut faceting of this sapphire is technically significant for both optical behavior and practical design. The cut employs concentric rectangular step facets on both crown and pavilion, creating broad reflective planes rather than the scintillation oriented flashes associated with brilliant cuts. The result is a controlled interplay of light and dark contrasts, which reinforces the gem s natural color rather than diluting it with excess brilliance. With a depth of 7.01 millimeters against a mean girdle diameter of approximately 8.77 millimeters, the sapphire shows an overall depth of approximately 80 percent, a proportion that favors color retention and saturation at the expense of maximum table brightness. For a greenish blue tone, this depth is advantageous, as it reduces the tendency to window and produces a consistently vivid visual appearance when viewed face up. The excellent polish and accurate facet alignment contribute to clean return of light, and the symmetry of the step cut keeps the eye focused on color planes and structural clarity.

Color technicalities are central to the gem s rarity profile. The hue sits between blue and green, with a dominant blue component under neutral white light and a perceptible green cast in certain viewing angles and lighting conditions, indicative of pleochroic behavior common to corundum. Saturation is vivid, meaning the color is strong and pure without appearing overly dark, and the tone is balanced so that the stone communicates presence even in more compact mounting profiles. Greenish blue sapphires of this size and clarity from Madagascar are comparatively uncommon compared with classic cornflower blue and deep royal blue material, which enhances collectibility. Heat treatment in this specimen has been applied to optimize chromophore distribution and to reduce inclusional contrasts, while leaving the clarity and crystal structure intact. The combination of eye clean clarity, vivid saturation, and a substantial five plus carat weight produces a gem that performs well under photographic reproduction and live appraisal, maintaining color fidelity across both.

From a gemological and practical perspective, this sapphire benefits from the inherent durability and optical properties of corundum. With a hardness of nine on the Mohs scale, the stone is highly resistant to abrasion and suitable for daily wear in rings, pendants, and high contact jewelry, provided appropriate mounting protection is used. Corundum s refractive index range, approximately 1.760 to 1.770, supports strong light return and contributes to the gem s apparent depth and richness, especially in step cut specimens where facet planes are large and reflective. The lack of true cleavage in corundum reduces risk during setting, while the specific gravity near four gives the stone a solid feel when handled. The excellent polish and precise facet junctions enhance both brilliance and surface reflection, creating crisp mirror planes that emphasize the greenish blue color. For design considerations, an open prong mount or a bezel with a high crown can allow the table to present the saturated color, while a warm metal such as 18 karat yellow gold can visually intensify green notes, and white metals like platinum or 18 karat white gold can produce a cooler, contemporary aesthetic.

Rarity and provenance are key selling points for discerning clients. A transparent, eye clean, vivid greenish blue sapphire at 5.67 carats in an emerald cut, originating from Madagascar, stands out in the market because color distribution, clarity, and size rarely converge at this level in this particular hue. The Natural Sapphire Company offers this stone to collectors, connoisseurs, and jewelers seeking a centerpiece gem that balances technical cutting excellence with noteworthy provenance. Because emerald cut sapphires reveal internal characteristics readily, the eye clean grade amplifies collector confidence and design flexibility. We encourage potential buyers to request detailed imagery, viewing under multiple light sources to appreciate pleochroic shifts, and any available gemological reports that document enhancement and origin. For bespoke settings, our team can advise on proportions and mounting styles that optimize color performance while preserving structural integrity, and we stand ready to assist with secure acquisition and personalized design services.