0.66 Ct. Bluish Green Sapphire from Madagascar

This sapphire is a precisely faceted, transparent 0.66 carat round, with calibrated dimensions of 5.10 by 5.12 by 3.40 millimeters, cut to a mixed brilliant architecture. The mixed brilliant execution combines a brilliant-style crown, including a well-proportioned table, star facets and bezel facets, with a modified pavilion that employs a combination of brilliant and step-like facet junctions, producing controlled scintillation and strong return of white light while allowing color to play through the pavilion. The measured depth of approximately 66.5 percent yields balanced crown and pavilion relationships, supporting lively brilliance without sacrificing color saturation. Clarity has been assessed as very very slightly included at eye level, indicating minute internal features that do not impede transparency or light transmission when mounted. Color is described as bluish green with medium intensity, presenting a nuanced, parti-like palette that shifts subtly with viewing angle and lighting. Polish is excellent, and symmetry is consistent with precision cutting practices, reflecting the high standards we maintain at The Natural Sapphire Company. Enhancement note, the stone has been heat treated, a stable and commonly accepted treatment used to optimize color and to anneal growth features in corundum, and its Madagascar origin contributes to the particular bluish green tonality seen in this specimen.

From a gemological perspective this sapphire exhibits the characteristic optical and physical parameters of gem-quality corundum, which directly inform its performance in jewelry. The bluish green hue arises from trace element chemistry typical of sapphires, principally iron with minor titanium and variable chromium or vanadium signals in some material, producing color that sits on the blue-green spectrum rather than a pure green or pure blue. Corundum is anisotropic and pleochroic, so the stone will display different color intensities along different crystallographic axes, an effect that skilled cutting can either emphasize or minimize depending on the cutter’s intent. The mixed brilliant design here is executed to moderate pleochroic contrast, allowing a pleasing color blend when viewed face up and a lively interplay of flashes as the piece moves. Refractive index and birefringence values typical of corundum support crisp facet junctions and distinct facet reflections, enhancing the stone’s scintillation and the perception of depth despite its modest 0.66 carat weight. The medium color intensity is especially well-suited to settings where both color and light performance must balance, such as solitaire rings, delicate pendants, or as the center of a cluster design where surrounding accent stones will frame but not overwhelm the sapphire’s presence.

The internal clarity features are minimal and indicative of natural origin, consistent with a very very slightly included grade when observed at normal viewing distances. Under magnification the stone may present tiny pinpoint crystals and occasional needle-like silk that are minute and off-center, leaving the table and key facet fields effectively eye-clean. These inclusions do not compromise structural integrity or wearability, and the excellent polish ensures facet edges and junctions are sharp, maximizing contrast and return. The mixed pavilion arrangement helps mask any small inclusions by directing light away from them, while the well-executed girdle and crown proportions protect the stone in standard mounting processes. Heat treatment applied to this sapphire was performed to stabilize and enhance color and clarity in a permanent manner that does not involve glass or resin filling, retaining the corundum’s natural durability and suitability for everyday wear. Originating in Madagascar, the piece displays the parti-color and tonal subtleties often associated with the island’s alluvial and primary deposits, and our sourcing protocols aim to ensure ethical and verifiable provenance while preserving the geological integrity of the material we present.

Beyond its measurable physical and optical attributes, this bluish green sapphire carries the traditional metaphysical associations found in many cultures for stones in the blue and green spectrum, associations that appeal to collectors and wearers who value symbolic resonance as well as material quality. In metaphysical practice sapphires are often associated with mental clarity, calming focus, and clear communication, attributes linked to blue tones and to the throat chakra in energy traditions. The green component introduces heart-centered qualities, suggesting a balancing of intellect and emotion, facilitation of compassionate communication, and a stabilizing influence on mood. Wearers frequently report that bluish green sapphires are perceived as grounding yet intellectually stimulating, offering a sense of poise under pressure and an encouragement toward thoughtful expression. The stone’s medium intensity allows it to function as a wearable talisman that is neither overly bold nor visually muted, appropriate for daily use or for ceremonial contexts where clarity of intent and emotional balance are desired.

When considering this sapphire for a finished piece, its technical proportions, mixed brilliant faceting, and medium bluish green color make it a versatile candidate for both contemporary and classic settings. The balance of depth and diameter provides predictable performance in common mounting styles, and the eye-level clarity and excellent polish reduce the need for optical compensation via elaborate settings. From a metaphysical standpoint, the stone’s combined blue and green aspects make it an attractive choice for those seeking a single gemstone to support both communicative clarity and emotional harmony. As always, we advise that metaphysical attributions are subjective and complementary to the intrinsic gemological qualities provided in the technical assessment, and we are available to discuss setting options, matching accent stones, or additional documentation regarding the heat treatment and Madagascar origin for any buyer considering this exceptional 0.66 carat round bluish green sapphire from The Natural Sapphire Company.