AI Appraisal Estimate

This specimen is a natural zoisite, commercially known as Tanzanite, weighing 3.22 carats. It features a rectangular cushion mixed-cut with dimensions of 9.96 x 7.82 x 4.85 mm. The gemstone exhibits a vivid, saturated blue-violet hue, which is highly characteristic of premium Tanzanite sourced from the Merelani Hills of Tanzania. Physically, the gem is held by metal tweezers, showcasing its transparency. Upon close inspection, natural internal inclusions are visible, which serve as diagnostic markers for its natural origin. The craftsmanship of the cut appears symmetrical, designed to maximize light return and color depth within the crown and pavilion facets. The stone lacks visible surface abrasions or chips, suggesting it is in excellent condition for a loose gemstone. While the treatment is not specified in the accompanying IGI report metadata, most Tanzanites undergo gentle heating to enhance their blue-violet tones. This piece represents a high-quality contemporary gemstone suitable for high-end jewelry settings.

I have virtually examined this 3.22-carat rectangular cushion-cut Tanzanite. The specimen exhibits a highly desirable 'Vivid' blue-violet saturation, which is the primary driver of value in the zoisite market. The dimensions (9.96 x 7.82 x 4.85 mm) are well-proportioned, avoiding the bottom-heavy 'belly' often seen in stones cut to maximize weight over brilliance. Based on visual evidence, the saturation is consistent with top-tier material from the Merelani Hills. The presence of natural inclusions, while slightly impacting clarity, serves as a diagnostic indicator of natural origin, distinguishing it from synthetic imitations or glass. In the current retail market, fine Tanzanites over 3 carats command significant premiums due to the depletion of deep-blue veins in the mines. While the IGI report number is noted, I cannot verify its authenticity against the physical stone through an image. A definitive appraisal requires an in-person loupe examination to confirm the absence of surface-reaching fissures and a spectroscopic analysis to determine the extent of heat treatment, as 'unheated' stones command a 20-30% premium. My valuation assumes standard gentle heating. Further verification would require matching the internal 'fingerprint' inclusions with the IGI digital database to ensure the report corresponds specifically to this loose gem.