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2. Luminous gemstones - Wikipedia

   en.wikipedia.org/wiki/Luminous_gemstones

   The OED defines pyrope (from Greek Πυρωπός, lit. "fire-eyed")" as: "In early use applied vaguely to a red or fiery gem, as ruby or carbuncle; (mineralogy) the Bohemian garnet or fire-garnet"; and carbuncle or carbuncle-stone (from Latin "carbunculus", "small glowing ember") as: "A name variously applied to precious stones of a red or ...

3. Phosphorescence - Wikipedia

   en.wikipedia.org/wiki/Phosphorescence

   Some examples of glow-in-the-dark materials do not glow by phosphorescence. For example, glow sticks glow due to a chemiluminescent process which is commonly mistaken for phosphorescence. In chemiluminescence, an excited state is created via a chemical reaction. The light emission tracks the kinetic progress of the underlying chemical reaction.

4. Triboluminescence - Wikipedia

   en.wikipedia.org/wiki/Triboluminescence

   A diamond may begin to glow while being rubbed; this occasionally happens to diamonds while a facet is being ground or the diamond is being sawn during the cutting process. Diamonds may fluoresce blue or red. Some other minerals, such as quartz, are triboluminescent, emitting light when rubbed together. [19]

5. Friedelite - Wikipedia

   en.wikipedia.org/wiki/Friedelite

   Friedelite is a mineral [2] ... Its color can be pale pink, dark brownish red, red, brown, or orangish red. ... The mineral has a colorful luminescense under UV light ...

6. Fluorescence - Wikipedia

   en.wikipedia.org/wiki/Fluorescence

   Unlike with fluorescence, in phosphorescence the electron retains stability, emitting light that continues to "glow in the dark" even after the stimulating light source has been removed. [25] For example, glow-in-the-dark stickers are phosphorescent, but there are no truly biophosphorescent animals known. [29]

7. Opal - Wikipedia

   en.wikipedia.org/wiki/Opal

   Precious opal displays play-of-color (iridescence); common opal does not. [6] Play-of-color is defined as "a pseudo chromatic optical effect resulting in flashes of colored light from certain minerals, as they are turned in white light." [7] The internal structure of precious opal causes it to diffract light, resulting in play-of-color ...