Phosphorescence Some diamonds and other gemstones and minerals continue to glow or emit visible light for a period of time after exposure to visible, ultra-violet or other light, after the light source has been removed.
Phosphorescence
A continuing glow exhibited by some gemstones after the source of illumination has been removed.
Play of Color
Prismatic flashes of color seen within a gemstone. The color display in Opal.
PHOSPHORESCENCE. The property possessed by substances of emitting light in certain conditions.
PIGEON BLOOD. A deep clear red; the gem colour of the most highly prized specimens of the ruby.
Phosphorescence...Luminescence emanating from substances that have been irradiated with ultraviolet light or X-rays, but persisting after the source of stimulation has stopped.
Piezoelectric...A substance that becomes electrically charged by pressure.
Phosphorescence
Also known as after glow. This phenomenon is called when diamonds luminescent under UV light continue to fluoresce even when the light is turned off.
Pinpoints ...
Although the term phosphorescence is derived from phosphorus, the reaction which gives phosphorus its glow is properly called luminescence (glowing by its own reaction, in this case chemoluminescence), ...
UV Fluorescence/Phosphorescence: Strong, variable
Toughness: Fragile due to brittleness
Cleavage: Easy in 4 directions ...
phosphorescence Emission of visible light by a substance, such as a mineral, that is exposed to ultraviolet light and absorbs radiation from it. The light appears in the form of glowing, distinctive colors.
Kunz described this durable pink gemstone as having two distinct properties: phosphorescence—where, like diamond, kunzite glows in a darkened room after it has been exposed to the sun’s ultraviolet rays and pleochroism— ...
By short-wave (235.77 mm) UV light, the stone fluoresces a deep yellow, but we saw no phosphorescence on cutting off the radiation.
Besides assessing the color, they are analyzed for factors like optic character, refractive index, birefringence, dispersion, fluorescence, phosphorescence and clarity of color.
Phosphorescence - A lingering emission of light following exposure to Ultraviolet light or other energy.
Pinacoid - A crystal face parallel to two crystal axes (three in the hexagonal system).
Common opal often green. Phosphorescence sometimes strong.
Spectra
none ...
An occasional persistence of light emission is termed phosphorescence. In most diamonds, however, the fluorescence is so slight that it can only be evoked by direct radiation with concentrated short or long wave ultraviolet light.
This phenomenon of fluorescence and/or phosphorescence is the result of UV radiation absorbed by impurities or structural defects within the crystal structure, resulting in an oscillation of electrons between energy levels, ...
In fact, it is said that a Chinese emperor lit an entire room in his palace with a singly large ruby. While this may be a bit of an exaggeration, rubies do have a natural red phosphorescence that makes them appear to give off light.
Fluorescence: Some show a mustard-yellow or yellow orange under long or short wavelength U.V.. Some show a dull yellow phosphorescence. Prolonged exposure to strong u.v. light can cause some colorless zircons to revert to their original brown color.
Most natural emeralds are inert (non-fluorescent) under long-wave UV, and most synthetic emeralds show a moderate to strong red fluorescence. Because of the prominent exceptions, this test alone is inconclusive.
Phosphorescence ...
Once the light source is removed however, the fluorescence is no longer observed. If, in rare situations, light emission continues for a period after the exciting light has been turned off, the phenomenon is called phosphorescence.
I propose the name Kunzite, for reasons unnecessary to give to American and European scientific men." This publication (which included ten lines quoted from Sir William Crookes on the phosphorescence of kunzite) initiated the following exchange: ...
 See also: Rough, Color, Crystal, Stone, Fluorescence
  
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