phosphoresce

There are several natural minerals that phosphoresce when excited by an ultraviolet ("black") light source.

Things that phosphoresce "glow" for much longer because the excited electrons take so much longer to come back down to their initial energies.

Light Sticks: Chemical units that make light after twisting to release chemicals that phosphoresce.

The most common fluorescence is blue, and such stones may also phosphoresce yellow-this is thought to be a unique combination among gemstones.

Boron-doped diamonds transmit light down to 250 nm and absorb some red and infrared light (hence the blue color); they may phosphoresce blue after exposure to shortwave ultraviolet light.

Still, it had to be well into the night, or into the planetary sleeping period, at any rate (supposing that the two did not coincide), as otherwise the halls would not be so empty and the bas-reliefs on the wall would not phosphoresce unwatched.

Diamonds exhibit fluorescence, that is, they emit light of various colors and intensities under long-wave ultra-violet light (365 nm): Cape series stones (type Ia) usually fluoresce blue, and these stones may also phosphoresce yellow, a unique property among gemstones.