AI Appraisal Estimate

This item is a loose, natural tanzanite gemstone accompanied by a formal identification report from the Instituto Gemologico Español (IGE). The gemstone is faceted in a pear-cut shape, characterized by a rounded end tapering to a single point. According to the document, the stone weighs 17.75 carats and measures 19.71 x 13.31 x 9.56 mm. The color is described as 'violetish blue' with a 'translucent' transparency level. The stone exhibits noticeable internal inclusions and a somewhat milky or cloudy appearance, which may contribute to its translucent (rather than transparent) rating. It is currently housed in a clear protective security seal packet marked with report number D-65417. The documentation specifies the origin as Tanzania and notes an enhancement code of 'F2 - oil,' indicating moderate clarity enhancement. While the physical stone shows a pleasant violet-blue hue typical of the Zoisite variety, the inclusion levels suggest a lower grade than eye-clean specimens. The report is dated March 26, 2024, and includes a verification QR code and the official IGE seal, providing a modern standard for gemological provenance and authentication.

I have examined the digital representation and provided specifications for a 17.75-carat pear-cut natural Tanzanite (Report D-65417). The stone displays a desirable violetish-blue hue, though its 'translucent' transparency and noted 'F2 - oil' enhancement significantly impact its market positioning. Typically, high-end Tanzanite is valued for eye-clean clarity and exceptional transparency; this specimen’s milky appearance and moderate clarity treatments place it in a lower commercial tier despite its impressive carat weight. In the current market, while Tanzanite remains a 'single-source' gemstone from Tanzania, the abundance of lower-clarity material means that size alone does not dictate premium pricing. Comparable stones of this size with significant inclusions generally trade at wholesale between $70 and $100 per carat. The inclusion of an IGE report adds a layer of authentication that supports the value, though the 'F2' oiling is a vital disclosure as it is less common than standard heat treatment and may affect long-term stability or require special care. Please note that this appraisal is based on image analysis and report data. A definitive valuation would require a physical inspection to assess the stone's pleochroism, the true extent of the internal fractures, and to confirm the efficacy of the clarity enhancement under a 10x loupe and microscopic lighting. The presence of the security seal is a positive security feature, but independent verification of the QR code and serial number via the IGE database is necessary to ensure the document’s validity.