1.51 Ct. Greenish Blue Sapphire from Madagascar

This 1.51 carat cushion shape greenish blue sapphire is a study in proportion and optical precision, rendered in a transparent material that immediately communicates premium quality. The stone measures 7.53 by 4.68 by 3.85 millimeters, producing a depth that represents approximately 63.1 percent of the average of the length and width, a proportion that balances color saturation and light return. At 1.51 carat the sapphire occupies a strategic weight category, larger than the common half carat to one carat sizes yet compact enough to maintain high price per carat relative to larger, more readily available material, this weight demonstrates both presence in a setting and efficient yield from fine rough. The color reads as greenish blue with intense saturation, a chroma level that pushes the stone toward premium grading, while the clarity is evaluated as very very slightly included at eye level, which in practical terms means the stone appears clean to the unaided eye and the minute inclusions remain detectable only under magnification, reinforcing its desirability at this carat weight.

Technically the cutting style is faceted with a mixed brilliant cut, an approach chosen to maximize both scintillation and color performance in a cushion outline. The mixed brilliant geometry typically employs a brilliant facet schema on the crown to produce lively scintillation, combined with a controlled pavilion facet arrangement that optimizes light return and minimizes windowing, the combination yielding a dynamic play of light without sacrificing color saturation. The facet junctions exhibit an excellent polish throughout, which reduces internal light scatter and enhances perceived clarity and brilliance. From a gemological perspective this sapphire benefits from corundum refractive properties, producing strong refraction and ample dispersion that translate into crisp facet contrast and measured fire, while observable pleochroic behavior subtly shifts the green and blue tonal components with changes in orientation, a characteristic that is managed by the cutter to maintain a stable intense appearance face up. The measured dimensions and mixed brilliant faceting indicate a competent balance between table size and crown height, a design choice that supports even brightness across the table and controlled scintillation along the pavilion facets.

Equally important to the cutting and proportions is the stone’s natural state, enhancement listed as none, confirming the specimen is untreated, unheated, and free of color diffusion or other common laboratory interventions, a factor that materially elevates market value and collector interest at this weight and quality. Origin is Madagascar, a source known for producing sapphires with vibrant color and fine crystal quality, and provenance from that region adds context for the observed greenish blue hue and the crystal habit that allowed the cutter to realize a well proportioned cushion. For buyers seeking a premium, natural sapphire at a refined scale, a 1.51 carat untreated stone with intense color, very very slight inclusions at eye level, and excellent polish is comparatively rare and represents a meaningful investment in both aesthetic and intrinsic gemological terms. At The Natural Sapphire Company we present this sapphire with full disclosure of dimensions, cutting style, clarity grade and enhancement status, and we can arrange gemological documentation and bespoke mounting advice to ensure the 1.51 carat cushion sapphire is showcased to its fullest potential in a setting that preserves its optical performance, color integrity and long term value.