1.58 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This natural round blue sapphire weighs 1.58 carat, and measures 7.18 by 7.16 by 4.24 millimeters. The cutting style is faceted, executed as a mixed brilliant cut, and the overall surface condition is described as excellent polish. Clarity is very very slightly included when evaluated at eye level, providing a largely eye clean appearance. Color is medium intensity blue, with the gemstone originating from Ceylon Sri Lanka, and it is offered in its natural state with no enhancement. The Natural Sapphire Company presents this gem as an example of a well proportioned, untreated Ceylon sapphire that balances color, clarity, and light performance.

The mixed brilliant cut is engineered to enhance the sapphire inherent optical properties, and this stone demonstrates that relationship clearly. The cut combines a brilliant facet arrangement on the crown with a refined pavilion design that optimizes internal reflection and light return. The crown facets break incoming light into multiple small flashes, creating crisp scintillation, while the pavilion facets channel light back through the table and crown in a controlled manner, increasing perceived brightness. The table and crown geometry allow for strong return of white light, and the pavilion depth and angles encourage internal reflection rather than light leakage, which is important in a corundum species with a refractive index near 1.76 to 1.77. The result is balanced brilliance and a lively play of light across the crown, with well defined contrast patterns that enhance both sparkle and depth.

Proportions play a decisive role in how a sapphire displays its color and brilliance, and this gem has a depth of 4.24 millimeters that yields an overall depth to diameter ratio of approximately 59 percent. This proportion is consistent with an intent to maximize light return while preserving color saturation. The mixed brilliant cut supports color concentration by permitting light to spend more time within the pavilion before being returned, which deepens the perceived blue without sacrificing dispersion and scintillation. Excellent polish further improves surface reflectivity, allowing crisp mirror like highlights on facet junctions that translate to enhanced luster and clean visual performance. Clarity described as very very slightly included at eye level indicates that internal features are minimal and do not interfere with facet reflections, meaning that the stone will present consistent brilliance in varied lighting conditions.

From a practical perspective this 1.58 carat round Ceylon sapphire is well suited to settings that accentuate its round silhouette and mixed brilliant cut light behavior. The diameter near 7.17 millimeters occupies an elegant visual scale on most finger sizes, and the balanced proportions allow the stone to perform as a solitaire or as a focal point in more complex designs. The untreated origin from Ceylon Sri Lanka contributes to its desirability for buyers who prioritize natural state material, and the combination of medium color intensity, eye level clarity, mixed brilliant cutting, and excellent polish results in a gem that communicates both color depth and lively brilliance. For those evaluating sapphires by optical performance and craftsmanship, this specimen represents a considered synthesis of material quality and cutting technique, as offered by The Natural Sapphire Company.