1.78 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This transparent 1.78 carat cushion shaped blue sapphire measures 7.66 by 6.51 by 4.26 millimeters, and presents a mixed brilliant faceting scheme executed to precise proportions, the result of a cutting strategy that balances color saturation with optimal light return. The mixed brilliant cut combines a brilliant crown articulation with a carefully arranged pavilion, the crown facets dispersing light across the table and the pavilion facets returning concentrated flashes, creating an even field of scintillation across the cushion silhouette. The stone exhibits vivid color intensity, a saturated blue typical of fine Ceylon material, with excellent polish that produces crisp facet junctions and strong facet contrast. Clarity is graded very slightly included at eye level, with internal features that are minor, well distributed, and contained beneath the facet planes, preserving transparent transmission and allowing the sapphire to read clean to the naked eye. The piece has undergone routine heat treatment, a stable and widely accepted enhancement that refines the blue hue without compromising the gem structure, and the origin is Ceylon, Sri Lanka, which contributes to the lively, vibrant tone and subtle lively undertones that enliven the overall appearance.

From a craftsmanship perspective, the cutter has prioritized proportional depth and pavilion geometry to achieve both color saturation and mechanical balance, the measured depth of approximately 60 percent providing a pleasing visual profile without excessive windowing or darkness. The mixed brilliant faceting in this cushion iteration concentrates smaller star and kite facets on the crown to break up light into multiple return paths, while the pavilion planes are configured to act as a controlled reflector, maximizing brightness from practical viewing angles. The excellent polish enhances optical performance by minimizing surface diffusion and preserving facet sharpness, which is particularly important for sapphires where clean facet junctions translate directly to perceived color purity and brilliance. The girdle presents as proportionate to the pavilion and crown planes, providing a secure location for bezel or prong seating, and the clarity characteristics being very slightly included at eye level mean that the stone maintains robust transparency while retaining natural fingerprint, which is often desired by connoisseurs who value natural origin and intact structure.

In terms of durability and suitability for daily wear, this sapphire is an ideal candidate for everyday jewelry, being composed of corundum with a Mohs hardness of 9, which gives it exceptional resistance to scratches, abrasion, and surface wear compared to lower hardness gemstones. Corundum has no true cleavage, and in practical terms this material exhibits high toughness, meaning it withstands knocks and incidental contact inherent to daily life when set appropriately. For maximum protection in a ring intended for constant wear, a bezel or low profile four prong setting that covers and supports the gently rounded corners of the cushion will protect the girdle and pavilion junctions while allowing the mixed brilliant crown to project brilliance, and such settings also reduce the likelihood of snagging. Heat treatment performed on this stone is stable under ordinary household conditions, and standard maintenance consists of cleaning with warm water, mild detergent, and a soft brush, with periodic professional inspection to confirm setting security. The Natural Sapphire Company presents this 1.78 carat Ceylon cushion sapphire as a technically refined example of balanced cutting, vivid color, and structural durability, making it an excellent choice for customers seeking a sapphire that performs beautifully in daily wear jewelry while meeting the expectations of knowledgeable buyers.