1.68 Ct. Bluish Green Sapphire from Tanzania

This 1.68 carat cushion shape bluish green sapphire from Tanzania combines precise cutting geometry with an unenhanced, natural body color, offering a gem that is both technically refined and transparently honest. The stone measures 7.21 x 5.93 x 4.02 mm, with a depth to average dimension ratio of approximately 61 percent, a proportion chosen to balance face up appearance with pavilion depth for optimal light return. The mixed brilliant cut integrates a faceted crown with a modified pavilion, creating a controlled interplay of larger table facets and small brilliant facets that enhance scintillation while preserving color saturation. Clarity is graded slightly included at eye level, the inclusions being pinpoint and linear growth features that do not interrupt the window of transparency, and that in practice function as natural fingerprinting of origin rather than detractors from brilliance. The polish is excellent, with clean facet junctions and finely executed facet planes that maximize specular reflection. No enhancement has been applied, so the intense color intensity observed is native to the crystal lattice and the trace element chemistry of this Tanzanian deposit, providing an authentic chromatic profile that shifts subtly from green to blue depending on viewing angle.

In technical comparison to famous historical sapphires, this gem occupies an entirely different but complementary niche, combining the authentic natural state of storied museum pieces with modern optical refinement. The Logan Sapphire and the Stuart Sapphire are celebrated for their strong, pure blue tones and historical provenance, while the Star of India is renowned for its enormous size and asterism that comes from oriented needle inclusions, factors that depart from the transparent, faceted aesthetic of this stone. The Blue Belle of Asia illustrates the upper echelon of vivid blue saturation in large Sri Lankan material, whereas this Tanzanian sapphire is notable for an intense bluish green hue that lies between classic cornflower blue and a deep teal, a color that is less common in untreated material and thus highly desirable to connoisseurs. Where many historically famous pieces were cut in older styles or were preserved in large cabochons for spectacle, the mixed brilliant faceting here is engineered to optimize both scintillation and color yield in wearable sizes. The presence of slight inclusions, paired with the lack of heat treatment, aligns this specimen with the expectations of collectors who prioritize provenance and natural state over manipulated appearance.

From a practical and design oriented standpoint, this cushion sapphire is particularly well suited to bespoke jewelry projects where color nuance and optical performance are paramount. The intense bluish green will appear cooler under LED and daylight balanced sources, and warmer under incandescent lighting, an effect amplified by the facet architecture and natural pleochroism inherent to corundum that allows discreet shifts from greenish blue to bluish green when the stone is rotated. With a Mohs hardness of nine and excellent facet polish, the gem is durable for everyday wear, and the cushion outline with softly rounded corners lends itself to either classic four prong settings that reveal the pavilion interaction with light, or halo and bezel treatments that emphasize color and protect the girdle. For collectors who seek traceable origin and natural state, the unheated Tanzanian origin adds documented geological interest, and the slight inclusions serve as microscopic evidence of growth conditions rather than visual compromises. The Natural Sapphire Company is pleased to present this transparent 1.68 carat cushion shape sapphire, offering expert cutting, natural color, and honest clarity in a size that adapts well to both modern and vintage inspired settings, and we invite inquiries for detailed imagery, facet mapping, and discussion of mounting options to ensure this stone meets precise design and technical criteria.