1.15 Ct. Bi Color / Parti Sapphire from Madagascar

This is a beautifully transparent 1.15 carat asscher octagon shape bi color parti sapphire, with precise dimensions of 5.65 by 5.31 by 4.08 millimeters, faceted with an asscher cut that emphasizes geometric symmetry and a clear step faceting pattern. The stone has an intense color intensity, and an excellent polish that allows crisp facet delineation and lively reflections. Clarity is graded as very slightly included, evaluated at eye level, which means that the gem presents minimal internal features that do not detract from its overall transparency or brilliance when viewed without magnification. This sapphire is unenhanced, no enhancement, straight from Madagascar, a source noted for producing a wide spectrum of natural sapphire colors, including highly desirable teal and parti tones. At The Natural Sapphire Company we prioritize origin transparency and disclose that this gem is natural and untreated, attributes that enhance its appeal for collectors and educated buyers alike.

The asscher cut is an elegant choice for a bi color parti sapphire because its concentric step facets and large table create a window into the stone that showcases subtle color shifts across the pavilion and crown, while preserving broad flashes of color that read as depth and saturation. With the measurements given, the pavilion depth and crown proportions were tailored to balance color saturation and light return, minimizing windowing and maximizing the appearance of intense tone across the face up view. The octagonal outline of the asscher shape lends a vintage Art Deco character to the stone, while the faceting strategy preserves the parti effect so that both the bluish green and the softer green zones are visible from multiple angles. For a buyer interested in custom mounting ideas, an open basket or a bezel with a broad gallery will allow light to enter the pavilion and animate the parti color, while a closed back could mute the color contrast, so the choice of setting should reflect the desired visual outcome.

Clarity and untreated status are essential considerations for educated buyers, and this sapphire satisfies both. Very slightly included at eye level indicates naturally occurring inclusions that are typical for corundum, such as pinpoint crystals or fine silk, which may be detectable under magnification but remain unobtrusive to the unaided eye. These internal characteristics often serve as natural fingerprints that confirm the gem is unheated and unenhanced, and they can add to the gemological story and rarity of the piece. Because there is no heat treatment, the stone retains its original crystal lattice condition and natural trace element distribution, factors that contribute to its stability and long term value. The excellent polish further enhances the gem, ensuring clean reflections and minimal surface disturbance, which is particularly important for faceted styles like the asscher where facet junctions and symmetry are highly visible.

Comparing hue and tone to sapphires from other famous locations helps place this Madagascar piece in context. The hue here leans toward a complex teal, with both bluish green and yellowish green zones forming a parti effect and an intense tone that reads darker and more saturated than many Ceylon, or Sri Lankan, sapphires, which typically present lighter, brighter cornflower and cornflower leaning blues with a more vivid, less green leaning hue. By contrast, classic Kashmir sapphires are renowned for a deep velvety cornflower blue with a slightly softer tone and a silky diffusion caused by microscopic inclusions, characteristics that are unlike the crisp parti zoning of this Madagascar stone. Montana sapphires, which are often prized for their delicate teal and cornflower zones, generally show a paler, more pastel tone than the intense color intensity of this gem, while Australian sapphires can demonstrate very dark, inky greens and blues, often deeper in tone and more uniform in hue than the dynamic bi color display seen here. This comparison highlights why Madagascar material is so compelling, it can exhibit the vivid saturation of tropical sources while maintaining the interesting biphasic color dynamics that collectors value, and it sets this particular stone apart from the more single hue tradition of Kashmir and Sri Lanka, and from the often more muted palette of Montana.

For the discerning buyer considering this stone from The Natural Sapphire Company, practical considerations include visual placement, metal selection, and the value implications of an untreated bi color sapphire. At 1.15 carats and the illustrated face up size, this gem makes an elegant center for a refined ring, a striking pendant, or a bespoke pair of stud settings, and it plays particularly well with warm yellow gold if one wishes to emphasize the green lean, or with white gold or platinum to highlight the blue elements and the asscher cut facets. The untreated status and Madagascar origin contribute positively to collectibility and long term value, because natural parti sapphires that are free of heat treatment are less common and thus more sought after by educated buyers and collectors. We recommend an open style setting that allows light to interact with the pavilion, and we invite prospective clients to request additional high resolution photos or a short video to observe the color shift under different lighting conditions. If you would like assistance with custom design, provenance documentation, or a formal appraisal, The Natural Sapphire Company is available to guide you through the selection and setting process, ensuring that this unique asscher octagon bi color parti sapphire is presented to best advantage for both wear and long term enjoyment.