1.36 Ct. Green Sapphire from Madagascar

This listing describes a single transparent green sapphire weighing 1.36 carat, cut to an oval outline, with finished dimensions of 7.34 by 6.19 by 3.99 millimeters. The gem is fashioned in a mixed brilliant cut, combining a faceted brilliant style crown with carefully proportioned pavilion geometry to optimize both return of light and scintillation. Clarity is graded as very very slightly included when evaluated at eye level, and the gem exhibits a medium light color intensity with a cool green tone. The polish is excellent, and the sapphire is untreated, with no enhancement reported. The Natural Sapphire Company confirms the origin of this stone as Madagascar, and the accompanying imagery shows the stone at hand scale and in tweezers for reference.

The optical performance of this sapphire is the result of both its intrinsic crystal structure and the precision of the cutting. Sapphire is corundum, a trigonal crystalline form of aluminum oxide. This structure gives the material a high refractive index in the range typical for gem quality corundum, and a modest birefringence that can contribute to subtle internal color variation when the stone is rotated under the light. The hardness of corundum at nine on the Mohs scale allows cutters to achieve sharp facet junctions and durable facet planes, and this mechanical stability is a foundation for the crisp reflections that define the gem sparkle. Light entering the stone is refracted and internally reflected by those carefully angled facets, then returned to the viewer in concentrated flashes of brightness and color. The mixed brilliant arrangement in this oval maximizes both broad area brilliance and small scale scintillation, producing an energetic and lively appearance that is perceptible even at modest sizes.

The mixed brilliant cut combined with the sapphire proportions produces an especially effective balance of light return and color saturation. The length to width ratio of approximately 1.19 yields a classic oval silhouette that retains good face up presence without appearing elongated. The measured depth relative to the average of the length and width is within a range that supports strong internal reflection while avoiding excessive light leakage. The very very slight inclusions noted at eye level are minimal in character, and because the stone is transparent and well faceted they do not materially interrupt the play of light. The medium light intensity of the green tone is well integrated across the table and crown facets, and the absence of post extraction treatments preserves the natural distribution of color and the inherent pleochroic tendencies of the material. Taken together, the crystal chemistry, optical constants, and faceting geometry give this green sapphire a sparkle and liveliness that are distinctive among colored gemstones.

Practical considerations include the stone stability, visual versatility, and setting suitability. As a natural corundum, the sapphire is well suited for daily wear settings due to its high surface hardness and resistance to abrasion. The 1.36 carat weight and its oval dimensions place it in a size class that reads well as a solitaire center, or as a central element in a bespoke cluster or three stone design. The untreated origin from Madagascar imparts a particular character to the green, a cool nuanced green that interacts cleanly with white metal and warm metal mountings. The Natural Sapphire Company provides full provenance and gemological detail with this listing, and our team can advise on setting geometries that preserve the light path and protect the stone while highlighting its mixed brilliant cut performance. High quality polish, precise facet alignment, and balanced proportions are the technical hallmarks that give this green sapphire a refined, enduring sparkle.