0.80 Ct. Alexandrite from Tanzania

This exceptional transparent alexandrite weighs 0.80 carat and is fashioned as a cushion shape with a mixed brilliant cut, measuring 5.96 x 5.21 x 2.88 mm. At eye level the stone is graded as eye clean, which means no inclusions are visible without magnification, a highly desirable attribute for an alexandrite of this size. The piece exhibits a medium color intensity and an excellent polish, both of which contribute to lively light return and a refined surface appearance. This alexandrite displays the classic color change that defines the species, showing a bluish green appearance under fluorescent lighting and a reddish purple hue under incandescent lighting, a transition that is smooth and well balanced for a gem in this weight range. Importantly this stone is natural and untreated, with no enhancement reported, which enhances its rarity and market confidence because untreated color change alexandrites command a premium among informed buyers.

The Tanzanian origin of this alexandrite materially contributes to its appeal and value, because Tanzanian deposits have produced color change stones that combine transparency with attractive color shifts and favorable clarity. The color change phenomenon in alexandrite is primarily associated with trace chromium and the interaction of other chromophores in the crystal lattice, and stones from Tanzania often display a pleasing balance between the green and red tones that collectors and connoisseurs prize. Provenance matters to educated buyers because it informs expectations about crystal chemistry, typical inclusions, and cutting traditions, and Tanzanian material is increasingly sought after for its quality relative to supply. For buyers who prioritize investment quality or a museum worthy center stone, this gem presents strong attributes, including a precise cushion outline, even pavilion proportions from the mixed brilliant cut, and a polish grade that maximizes brilliance without sacrificing the color change effect. The Natural Gemstone Company stands behind the accurate description and disclosure of this gem, and we recommend independent gemological documentation for collectors who require formal certification. This alexandrite is ideal for a refined ring or pendant where its color change can be experienced in varying light, and it represents a durable, elegant, and scarce natural treasure for the discerning purchaser.