UV-Fluorescent Scapolite - Tanzania - 7.67ct
A 7.67-carat square-octagonal step-cut scapolite from Tanzania, distinguished by a bright pastel lemon-yellow body color and an exceptional long-wave ultraviolet fluorescence that transforms the stone into an intense neon orange-yellow source of light.
In daylight, the gemstone presents a luminous lemon-yellow body with a medium-light tone and vibrant saturation. Subtle greenish-yellow flashes emerge through the faceted surface, while the high transparency allows light to travel deeply through the crystal rather than being confined to the crown.
Under long-wave ultraviolet illumination at approximately 365 nm, the stone exhibits an extraordinary orange-yellow fluorescent response extending throughout the visible crystal mass. This creates a second optical identity distinct from its daylight appearance: a gemstone that shifts from a restrained architectural yellow into an intensely luminous object under UV illumination.
The 12.30 × 12.27 mm square-octagonal outline and precision Asscher-style step cutting give the stone a particularly architectural presence. Concentric step facets create broad geometric reflections and a strong central return, while the deep pavilion structure emphasizes the substantial volume of the material.
A prominent diagonal fine-needle or growth-tube inclusion is visible beneath the table, resulting in a provisional SI1 clarity assessment based on the supplied macro and rotational imagery. The inclusion is an intrinsic feature of the stone rather than a surface characteristic, and its position becomes part of the gemstone's individual identity.
The supplied documentation identifies the stone as natural, untreated, and of Tanzanian origin, with GIA Report #5234141679 provided for identification and laboratory documentation.
A study in color, geometry, and luminescence, this scapolite possesses an optical character extending beyond conventional daylight appearance. Its unusual fluorescence, substantial size, documented laboratory report, and severe octagonal architecture make it particularly suited to a collector who values phenomena as much as conventional color.