AI Appraisal Estimate

This item is a rough, unpolished specimen of Girasol, a variety of quartz also known as Moon Quartz or Milky Quartz. It exhibits a distinct translucent-to-opaque milky white color with a soft, misty appearance that is characteristic of this silicate mineral. The physical construction is rugged and irregular, featuring sharp, angular edges and a prominent conchoidal fracture pattern on its surface, which is typical of high-silica stones when they are broken or chipped. The specimen appears to be approximately one to two inches in length, though its exact dimensions are difficult to confirm without a scale. Notably, it displays a subtle inner luminescence, a quality known as ‘girasol effect,’ which allows light to seemingly glow from within rather than just reflecting off the surface. There are no visible maker's marks or signatures, as it is a raw geological specimen. The condition is consistent with 'rough' material; it shows natural pitting, jagged ridges, and a matte texture where it hasn't been smoothed by water or industrial polishing. Because it is a natural stone, it represents a geological formation rather than a specific manufacturing period. The craftsmanship is nonexistent as this is a natural formation, but its quality is indicated by the consistent saturation of white color and the lack of visible dark inclusions or matrix rock attached to the specimen.

Based on my visual examination of the provided documentation and imagery, this specimen is a fine example of rough Girasol (Moon Quartz). The stone exhibits the classic milky translucency and internal light diffusion characteristic of high-silica quartz containing microscopic inclusions. The conchoidal fracturing and sharp, angular geometry confirm it is in its raw, unpolished state. The absence of visible matrix or host rock suggests a high-quality selection for the size. In the current minerals and gemstones market, rough Girasol is relatively abundant and primarily sourced from Madagascar. It is valued as lapidary rough or as a 'healing crystal' rather than a rare gem. Comparables for specimens in the one-to-two-inch range typically retail between $10 and $30 depending on the depth of the internal glow. The value is limited by its commonality and the lack of professional lapidary work. While the visual indicators are consistent with Moon Quartz, a definitive identification cannot be made through images alone. To fully authenticate the specimen and rule out synthetic simulations or common milky quartz, an in-person examination is required. This would include measuring the specific gravity and using a refractometer to confirm the refractive index of quartz (1.544–1.553). For a professional valuation of a higher-grade collection, provenance or locality documentation would also be beneficial.