1.59 Ct. Bluish Green Sapphire from Tanzania

This transparent 1.59 carat oval sapphire measures 8.17 x 6.02 x 3.89 mm, with a depth that works out to approximately 54.8 percent based on the mean diameter. The shape is a classic oval, and the stone is fashioned in a mixed brilliant cut, combining a brilliant style crown with a deliberately modified pavilion to balance scintillation and color saturation. Clarity is graded as very slightly included, evaluated at eye level, which permits clean visual fields across most facets while providing tiny internal signatures that authenticate natural origin. Color intensity is vivid, presenting a bluish green that reads as a well saturated teal under neutral light, and the surface finish is described as excellent polish, with crisp facet junctions and a smooth girdle. Enhancement is by heat treatment, a stable and industry accepted process that has been applied to optimize hue and tone without compromising structural integrity. Provenance is Tanzania, and this item is offered through The Natural Sapphire Company, where gem documentation and handling history accompany the piece.

From a gemological standpoint this sapphire presents an instructive interplay of optical properties that appeal to technically informed buyers. The mixed brilliant cut here uses small, proportioned crown facets to generate strong return of white and colored light, while the pavilion facet geometry is adjusted to deepen the apparent color rather than maximize sheer brilliance. This tailoring is particularly effective for corundum with pleochroic tendencies, as seen in many Tanzanian sapphires, where the stone shifts subtly between blue and green zones when rotated. The refractive properties of corundum, with refractive indices in the typical range for sapphire, combine with low birefringence to yield crisp facet definition and stable face up color. The very slightly included clarity grade means inclusions are minor and do not interrupt light transmission significantly at normal viewing distances, and the excellent polish enhances contrast and return, producing lively scintillation and well defined facet reflections. For setting recommendations, an open prong or partial bezel that preserves crown exposure will showcase the mixed brilliant dynamics, while a halo or side stone configuration can be used to isolate and emphasize the bluish green tone. The hardness of corundum, nine on the Mohs scale, ensures that once set correctly this stone will be suitable for daily wear, and the heat treatment noted is permanent under normal use, keeping the vivid color stable for generations.

Every technical attribute of this sapphire carries a lyric that informed buyers will appreciate, and there is a romantic provenance that parallels its scientific profile. Imagine the bluish green hue as the meeting of two Tanzanian waterscapes, the deep sky blue of a highland lake and the green shimmer of coastal mangroves, fused into a single well saturated tone by geological time and masterful cutting. The very slightly included clarity becomes part of the narrative, like a small ripple in a still lagoon, a human mark that testifies to a natural origin and to the sapphire having survived pressure, heat, and time. The applied heat treatment can be read as a final touch comparable to the low sun warming the surface of the water, coaxing out hidden depth and verve, while the mixed brilliant cut is the artisan s decision to render that depth into scintillation that catches the eye and the light. At The Natural Sapphire Company we document the origin and enhancement, and we present this stone as both a scientifically interesting specimen and a jewel with a story. Crafted and evaluated with precision, this 1.59 carat oval bluish green sapphire is offered as a technical gem and as an heirloom ready to carry a personal romance, whether set as an engagement center, a signature ring, or a pendant that captures light and memory alike.