Ghost Pr:YAP (Yttrium Aluminum Perovskite) — Rare Lab-Grown Fluorescent Faceting Rough

💎 Ghost Pr:YAP Rough — 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:YAlO₃), 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 — 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.

✨ Key Features:

• Color: Soft, ghostly green to yellow-green from praseodymium doping — pale and ethereal, often shifting subtly with lighting and orientation
• Fluorescence: Subtle and multi-band from praseodymium activation — 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 — the quiet "Ghost" namesake
• Hardness: ~8.5 on the Mohs scale — genuinely durable, suitable for rings and everyday-wear pieces
• Refractive Index: Biaxial/birefringent — roughly 1.92–1.95 depending on axis
• Pleochroism: Optically anisotropic crystal; orientation affects both color and brilliance, so plan your dop angle
• Dispersion: Low to moderate — color, glow, and durability are the draw here rather than fire
• Density: ~5.35 g/cm³
• Melting Point: ~1875 °C (3407 °F)
• Origin: Lab-grown using the Czochralski pulling method
• Cleavage: None, but brittle — 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.

📸 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 — 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 — worth dialing in before you commit your table.