1.56 Ct. Color Change Sapphire from Tanzania

One transparent cushion shape color change sapphire weighing 1.56 carats, with dimensions of 6.43 by 5.89 by 4.25 mm, presents a balanced combination of size and optical performance. The stone is fashioned with a mixed brilliant cut, a clarity grade described as very slightly included, evaluated at eye level, and an intense color intensity. The polish is excellent, and the material is unchanged by treatment, indicating no enhancement. Origin is Tanzania, and the gem exhibits the characteristic response of a color change sapphire when viewed under different lighting conditions, showing subtle shifts in hue and saturation between fluorescent and incandescent illumination. These baseline specifications establish the sapphire as a naturally occurring specimen with robust material quality and minimal internal disturbance to the passage of light.

The mixed brilliant faceting on the cushion outline has been executed to optimize interaction with incident light, and the geometric arrangement of crown and pavilion facets produces both strong return of white light and vivid color flashes. The mixed brilliant approach combines a faceted crown geometry that disperses light across the table and crown facets with a pavilion structure engineered to redirect light back toward the observer, thereby increasing brilliance and scintillation. In a cushion form, the rounded square silhouette with softened corners promotes a controlled play of light across larger facet planes, while the strategic placement of pavilion facets creates internal reflections that enhance depth of color. The intense color intensity of this sapphire is accentuated by those internal reflections, which concentrate and layer the gem body color so that color change is perceptible as a shift in dominant wavelengths under varying light types. Very slightly included clarity at eye level means that inclusions do not materially interrupt the designed light paths, allowing the faceting geometry to function as intended and to maintain strong light return and lively scintillation across the table and crown facets. Excellent polish ensures crisp facet junctions and minimally diffusive surfaces, so each facet behaves as an efficient mirror, preserving contrast and maximizing the perceptible play of light and color.

For mounting and everyday use the stone benefits from settings that preserve pavilion access to light, since the geometric faceting returns optimal brilliance when the pavilion is not excessively shielded. Prong settings or low profile open bezels allow light to enter and exit the pavilion area, maintaining the intended light performance of the mixed brilliant design. The sapphire s hardness contributes to its suitability for frequent wear, making it appropriate for rings and other jewelry subject to regular use, while the absence of enhancements confirms the natural state of its color and clarity characteristics. From a design perspective, cooler metal tones tend to accentuate the inherent blue to violet shift, while warmer metals can subtly influence perceived warmth without changing the gem itself. The Natural Sapphire Company presents this Tanzanian color change cushion as an example of deliberate cutting and polishing that leverages geometric faceting to maximize light play, offering a gem that combines material integrity and optical engineering in a single natural specimen. For additional technical documentation, viewing options under different lighting, or guidance on setting the gem to preserve its optical behavior, consult our technical staff for viewing and mounting recommendations.