1.30 Ct. White Sapphire from Ceylon (Sri Lanka)

This 1.30 carat round white sapphire is a study in proportion and optical engineering, presented by The Natural Sapphire Company, certified Other certified Colourless. The stone measures 6.61 by 6.57 by 4.31 millimeters, yielding an average diameter of 6.59 millimeters and a depth of approximately 4.31 millimeters, which corresponds to a depth of approximately 65.4 percent. The round outline is executed in a mixed brilliant cut, with a brilliant style crown that maximizes the table and star facets for high return, and a carefully configured pavilion that blends modified brilliant and subtle step elements to control contrast and directional scintillation. The color intensity is described as near colorless, which allows the full optical potential of corundum to manifest without the masking of strong body color, and the clarity is graded as very slightly included at eye level, indicating that inclusions are minute and do not disrupt the transmission of light through the stone.

The sapphire s structural attributes are the primary reason for its exceptional sparkle, beginning with the intrinsic optical constants of corundum. The refractive index in sapphire is high, and this stone benefits from that characteristic by producing strong internal reflection when facets are cut to angles that align with the critical angle for corundum. The mixed brilliant design is chosen with precision to exploit total internal reflection, channeling incident light back through the crown and table rather than letting it leak through the pavilion, which enhances both brilliance and apparent brightness. Facet junctions are crisply terminated, allowing narrow zones of high contrast that create the lively scintillation prized by connoisseurs. Dispersion in sapphire is modest compared to diamond, but the careful interplay of crown and pavilion angles, coupled with the near colorless body, produces well defined flashes of spectral color in motion, and a controlled contrast pattern that reads as both lively and elegant. The stone s moderate depth, approximately 65.4 percent, is an intentional compromise between maximum light return and face up spread, maintaining a large apparent diameter for the specified carat weight while preserving optimal internal reflection geometry.

Craftsmanship is evident in the execution and finishing of this sapphire, with an excellent polish reported that produces mirror flat facet planes and sharp facet intersections, both critical to unimpeded light performance and fire. The absence of any enhancement means the material is natural in its optical character, and the polish and facet architecture alone are responsible for the observed sparkle and luster. The very slightly included clarity grade indicates that inclusions are minimal, often restricted to pinpoint crystals or faint rutile silk, and positioned such that they are peripheral at table up viewing angles, preserving the stone s transparency and allowing uninterrupted passage of light. Origin is Ceylon Sri Lanka, a source known for producing high quality corundum with clean, bright body tones, and this provenance informs both the hue neutrality and the crystalline integrity observed. For discerning buyers who assess gems by their internal geometry, faceting logic, and finish quality, this round mixed brilliant white sapphire represents a technically superior example of proportion driven cutting, and it demonstrates how precise facet angle relationships, controlled depth, and excellent polish combine to yield a sparkle that is both intense and refined. The Natural Sapphire Company is pleased to offer this sapphire to clients seeking a near colorless, unenhanced gem with outstanding optical engineering and classical round presentation.