π Ghost Pr:YAP Rough β Ethereal Color, Hidden Glow, Hard-Wearing Rarity Meet one of the rarest faceting materials you'll ever put on the wheel: praseodymium-doped Yttrium Aluminum Perovskite (Pr:YAlOβ), affectionately known as "Ghost." Engineered as a high-performance laser host and fast scintillator crystal for radiation detection, this exotic lab-grown perovskite rarely escapes the optics lab β which makes it a true prize for collectors and cutters chasing something nobody else has. With a soft, otherworldly body color, a faint multi-band fluorescence, and a hardness that actually stands up to daily wear, Ghost Pr:YAP is equal parts science-lab pedigree and gem-bench drama. β¨ Key Features: Color: Soft, ghostly green to yellow-green from praseodymium doping β pale and ethereal, often shifting subtly with lighting and orientation Fluorescence: Subtle and multi-band from praseodymium activation β a faint pink under midwave UV (~302 nm), and a very slight greenish-blue under shortwave (254 nm) and longwave (365 nm). All reactions are gentle whispers rather than dramatic glows β the quiet "Ghost" namesake Hardness: ~8.5 on the Mohs scale β genuinely durable, suitable for rings and everyday-wear pieces Refractive Index: Biaxial/birefringent β roughly 1.92β1.95 depending on axis Pleochroism: Optically anisotropic crystal; orientation affects both color and brilliance, so plan your dop angle Dispersion: Low to moderate β color, glow, and durability are the draw here rather than fire Density: ~5.35 g/cmΒ³ Melting Point: ~1875 Β°C (3407 Β°F) Origin: Lab-grown using the Czochralski pulling method Cleavage: None, but brittle β standard care when cutting and setting Whether you're building a fluorescent or scintillator collection, hunting an exotic material with a genuine high-tech backstory, or simply want a durable, ring-worthy stone with a quiet ghostly glow, Pr:YAP delivers a rarity that's as fun under the lab lamp as it is on the bench. Each piece is sold by weight. πΈ Additional Notes: If you would like to see additional pictures of the piece(s) you're interested in, please feel free to contact me. I'll be happy to provide more images for your review. The color of the stone in the photo may vary slightly, as not all computer monitors are calibrated the same. Fluorescence is subtle across all bands. The pink midwave (~302 nm) reaction in particular requires a midwave lamp, which many hobbyists don't own β and even the shortwave/longwave greenish-blue is very faint, so this material may read as non-fluorescent under casual viewing. Because this material is pleochroic, orientation during cutting will affect the final color and brilliance β worth dialing in before you commit your table.
