0.83 Ct. Blue Sapphire from Tanzania

This transparent 0.83 carat cushion shape blue sapphire presents a refined combination of size, cut, and natural hue, making it well suited for custom jewelry applications. The stone measures 5.58 x 4.36 x 3.40 mm, dimensions that provide a substantial visual presence without overwhelming delicate settings. Cut to a mixed brilliant style, this sapphire balances table and pavilion faceting to return strong light performance while maintaining the classic cushion silhouette with gently rounded corners. Clarity is graded slightly included when evaluated at eye level, which is common for natural material of this type and contributes to the gem character without significantly diminishing its overall transparency. Color intensity registers as vivid, and the polish is excellent, producing clean facet junctions and consistent surface reflection. The stone originates from Tanzania and it has received no enhancement, attributes that are important to collectors and designers who prioritize natural provenance and untreated color.

The cushion shape and the provided proportions make this sapphire highly adaptable in bespoke designs, particularly for center stone roles in rings, pendants, and single stone earrings. At 5.58 x 4.36 mm and 0.83 carat, the gem offers a balance between prominence and wearability, fitting comfortably within common custom ring head profiles and pendant bezels. The mixed brilliant cut enhances sparkle while preserving depth, allowing the gem to read as larger face up than stones of comparable weight with deeper cuts. The softened square outline of a cushion lends itself to both classic and contemporary settings, allowing the designer to emphasize symmetry with four prongs, to secure and visually frame the stone with a low profile bezel, or to surround the seat with a halo of smaller accent diamonds to amplify presence without changing the core proportions.

Clarity and color characteristics inform both aesthetic choices and technical setting decisions. The slightly included grade at eye level indicates that inclusions are present but not dominant, and because the gem remains transparent with vivid blue saturation, those internal features are often visually integrated into the stone when set. For clients seeking a showroom appearance with maximum brilliance, a prong setting or a thin halo will allow light to enter and reflect freely. For designs emphasizing durability and everyday wear, a bezel or partial bezel can offer additional protection to the girdle and corners while preserving the cushion profile. The excellent polish supports crisp light return from facet facets, and the absence of enhancement means the color and clarity are natural attributes of the material, aspects that many custom commissions value for both ethical sourcing and long term stability.

From a practical standpoint, this stone is straightforward for precision mounting and CAD aided design due to its regular cushion outline and standard millimeter proportions. The 5.58 x 4.36 x 3.40 mm measurements allow jewelers to plan seat sizes and prong placements with confidence, and the 0.83 carat weight provides a predictable center of gravity in rings and pendants, which aids in creating balanced finished pieces. Given its Tanzanian origin and untreated status, this sapphire is an excellent choice for clients and designers who seek natural color with provenance. The Natural Sapphire Company offers detailed documentation and consultation for bespoke projects, and our specialists can advise on setting style, metal selection, and complementary accent stones to achieve the desired optical and wear characteristics. This cushion blue sapphire is an inherently versatile gem that integrates size, shape, and natural beauty, making it particularly well suited for thoughtful, custom jewelry creations.