1.51 Ct. Blue Sapphire from Tanzania

One beautiful transparent 1.51 carat oval shape blue sapphire from Tanzania, dimensions 6.45 x 5.61 x 4.70 mm, mixed brilliant cut, clarity grade included evaluated at eye level, vivid color intensity, excellent polish, no enhancement. The mixed brilliant cutting style on this oval places a full brilliant facet arrangement on the crown to maximize return of light, while the pavilion integrates precise step facets to deepen and saturate the face up color. The combination of brilliant and step faceting is a deliberate craft decision to balance sparkle and color depth, and to allow a smaller table to act as a window into the stone while maintaining scintillation. The cutting proportions yield a depth of approximately 77.9 percent based on the average of the length and width, a depth that concentrates color for a vivid blue face up appearance, with the trade off of a slightly reduced spread or face up diameter relative to a shallower cut of the same carat weight. The dimensions and cut profile are optimized to preserve weight from the rough, while the excellent polish ensures facet junctions are clean, facet planes are smooth, and light transmission is unimpeded by lap lines or polish pits.

Optical and clarity characteristics are described with technical precision, clarity graded included at eye level meaning that small natural inclusions are visible without magnification under normal viewing conditions, as is common with natural, unenhanced corundum. Typical inclusion types present in Tanzanian material include fine silk, occasional pinpoint crystals, and minute healed fissures, and in this example inclusions are positioned and sized so they do not interrupt the primary light pathways through the pavilion and crown. The vivid color intensity of this sapphire is notable, with strong saturation and a balanced hue that reads as a clear, pure blue head on, and minor pleochroic shift between slightly different blue tones across different crystallographic axes. No clarity treatments or heat enhancements have been applied, the sapphire is natural and untreated, and the combination of vivid saturation and transparency results in an attractive balance between brilliance and color. The symmetry of the oval outline is precise, the girdle is even and well finished, and the culet is proportioned to avoid light leakage, all contributing to uniform light performance and predictable optical behavior when set in jewelry.

Durability and suitability for daily wear are excellent, corundum being a mineral of Mohs hardness nine, second only to diamond for common gem materials, and exhibiting very high resistance to abrasion. The crystal structure of corundum makes it inherently tough for its hardness, with no true basal cleavage, which reduces the risk of catastrophic splitting from everyday knocks, although care should always be taken to avoid sharp impacts on facet junctions and girdle edges. Given the substantial hardness and the excellent polish on this piece, it is ideally suited to daily wear in rings, pendants, and bracelets when set with protective settings where appropriate, such as well finished prongs with sufficient shoulder protection or a bezel mount for maximal security. The mixed brilliant cut and vivid color deliver a high visual impact in a ring face up, while the stone retains structural integrity suitable for long term use in fine jewelry. Routine maintenance consists of professional ultrasonic or steam cleaning if the mounting allows, or warm soapy water and a soft brush for in home care, with periodic inspection of the setting at The Natural Sapphire Company or by a qualified jeweler to ensure prongs remain secure.

This Tanzanian, unenhanced sapphire is a technical and aesthetic statement, combining precise cutting choices, robust physical properties, and natural character from its internal features. For buyers who value exacting craftsmanship and documented natural origin, this 1.51 carat oval mixed brilliant sapphire offers a compelling package, with vivid color, excellent polish, and the toughness required for everyday wear, all presented with the confidence and provenance supported by The Natural Sapphire Company.