9.84 Ct. Bluish Green Sapphire from Madagascar

This 9.84 carat bluish green sapphire presents as a textbook emerald cut, with precise step facets and crisp, truncated corners that emphasize architectural symmetry and controlled light return. The stone measures 12.64 by 10.71 by 6.86 millimeters, yielding a depth of approximately 59 percent when calculated from the mean of length and width, a proportion that balances face up presence with internal color saturation. The large, flat table and graduated step facets on the crown and pavilion create broad flashes of color rather than scintillation, giving the gem a sophisticated, window like visual character that is prized in fine, classical settings. Clarity is graded as eye clean at eye level, a notable quality at this size, and the polish is excellent with tightly matched facet junctions and even facet planes, which together maximize the stone face up brilliance and preserve crisp facet outlines under magnification. The piece carries a C.Dunaigre certificate confirming origin as Madagascar and documenting the enhancement as heat treatment, a well established and stable practice for corundum that refines hue and reduces unwanted inclusions without compromising structural integrity.

From a gemological and craftsmanship perspective this sapphire is a high quality example of step cutting applied to corundum, and its material properties align with expectations for natural sapphire. As a corundum species specimen, typical refractive index values lie within the range of 1.762 to 1.770 and specific gravity is approximately 4.00, which contributes to the perceptible heft and visual density of color in larger specimens. The intense color intensity reported on the certificate is manifest as a balanced combination of blue and green components, with pleochroic character that can shift perceptibly toward blue or green depending on orientation and light source. The emerald cut emphasizes this pleochroism, so orientation in a mount becomes an important design consideration to display the preferred hue face up. The heat treatment disclosed is consistent with industry norms and is considered stable and permanent, and given the stone is eye clean at this size, internal features do not interfere with light transmission or with the step facet pattern. The excellent polish and careful symmetry indicate that the cutter optimized proportion and pavilion angles to enhance both color saturation and visual depth, avoiding the washed out appearance that can result from overly shallow cutting or the excessive darkness that can accompany over deep cutting.

As an investment grade asset this 9.84 carat, C.Dunaigre certified, Madagascar origin sapphire offers several positive indicators for future appreciation in value. Size and eye clean clarity at nearly 10 carats place the stone in a tier where supply is relatively constrained, especially for specimens that combine intense bluish green hue and fine cutting. Provenance documentation increases market confidence, and The Natural Sapphire Company provenance and disclosure history further enhance marketability, providing buyers and future resellers with reliable substantiation of origin and treatment. While untreated sapphires historically command a premium, high quality heat treated stones from respected sources retain strong value and are liquid in the global gem market, particularly when cut and polished to show excellent face up color and to meet the aesthetic expectations of collectors and designers. Demand drivers for this tone and hue include fashion cycles favoring unique blue green colors, the continued interest in colored stone collectors for larger emerald cut examples, and scarcity pressures as established deposits yield material at declining rates.

For investors considering acquisition, practical considerations can help protect and amplify future returns. Retain the C.Dunaigre certificate and all documentation provided by The Natural Sapphire Company, insure the piece, and avoid unnecessary recutting that would reduce carat weight and provenance value. Consider classic, reversible mounting options that showcase the pavilion orientation for optimal hue while allowing the stone to be reset without damage if resale is desired. Expect the most reliable appreciation over a multi year horizon, as colored stone markets typically respond to long term supply and demand trends rather than short term volatility, and prioritize certified, well documented pieces such as this example for both portfolio diversification and enjoyment as wearable art.