1.78 Ct. Bluish Green Sapphire from Tanzania

This is a natural, transparent sapphire from Tanzania offered by The Natural Sapphire Company, weighing 1.78 carats and fashioned into a classic cushion shape with dimensions 6.73 by 5.56 by 5.09 millimeters. The stone exhibits a bluish green hue with an intense color intensity and an excellent polish, and it is untreated, with no enhancement recorded. The cutter elected a mixed brilliant cutting style, which in this example pairs a brilliant style crown with a modified pavilion faceting scheme, producing a balanced fusion of table facet flash and deep color return. When assessed by proportion, the gem has a pavilion depth that yields an average depth ratio of approximately 83 percent based on the mean of the length and width, a relatively deep architectural profile that concentrates tone and saturation to present a richly colored face up appearance while maintaining notable transparency.

The mixed brilliant cut is executed to maximize both scintillation and color distribution, with small, well finished crown facets that break incoming light into lively flashes, and larger pavilion facets that channel light back through the body of the gem to reinforce the bluish green saturation. The cushion outline is gently rounded at the corners and exhibits symmetrical facet junctions that indicate careful lapidary control, contributing to even light return across the table and pavilion. The excellent polish is immediately evident under loupe inspection, with crisp facet planes and minimal surface disturbance, which allows for high resolution contrast between bright and dark facets. The cutter appears to have prioritized color concentration over extreme brilliance by preserving depth, a conscious design decision that is ideal for this type of color, because the deeper pavilion enhances the stone towards a velvety, intense face up tone while maintaining dynamic scintillation from the brilliant crown facets.

Clarity is described as very slightly included when evaluated at eye level, which means the inclusions are present but unobtrusive to overall transparency and face up beauty. In sapphires, such inclusions frequently take the form of tiny mineral crystals, isolated pinpoint crystals, delicate healed fractures, or oriented rutile needles known as silk, as well as growth zoning that records the crystal chemistry during formation. These internal features are not defects in a negative sense, they are unique identifiers that act as the gem's fingerprint, mapping the stone's natural growth history and supporting provenance when combined with other gemological data. Because this sapphire is not enhanced, those internal markers have not been altered or obscured by treatments, making them particularly valuable for identification and for connoisseurs who prefer verifiable natural material. In practical terms the inclusions in this stone do not interfere with durability, they are localized and stabilized by the competent cutting, and they contribute to the gemological story that many collectors and designers prize.

From a practical and design perspective this sapphire's combination of weight, cushion geometry, intense bluish green color, and mixed brilliant faceting makes it very adaptable for bespoke settings, particularly solitaire and halo configurations that either emphasize the concentrated color or enhance perceived size and brilliance. The relatively deep pavilion will present a dramatic color presence in a bezel or low profile prong mount, while a halo of well matched accent stones can amplify the visual spread and contrast. For ring projects, seat this gem so that the pavilion depth is accommodated without excessive elevation, to preserve both wearability and the stone safety. For clients seeking documentation, The Natural Sapphire Company can provide detailed imaging and gemological reporting to illustrate the inclusion pattern and to certify origin and treatment status. This Tanzanian cushion sapphire is an excellent example of natural corundum where lapidary choices, intact internal fingerprinting, and pure, intense coloration combine to produce a versatile and characterful gemstone, available through The Natural Sapphire Company.