Fluorescence is a luminescence that is mostly found as an optical phenomenon in cold bodies, in which the molecular absorption of a photon triggers the emission of another photon with a longer wavelength.
DIAMOND FLUORESCENCE
Fluorescence refers to a diamond's tendency to emit a soft colored glow when subjected to ultraviolet light (such as a "black light"). Roughly 30% of diamonds fluoresce to some degree.
Diamond Fluorescence
When we speak of Diamond Fluorescence, we are referring to the diamonds tendency to emit a soft colored glow when subjected to ultraviolet light (such as a "black light").
FLUORESCENCE:
A reaction to UV light. Fluorescence is graded from None to Very Strong.
Fluorescence
Some important tools to assist you in the identification of species at Mont Saint-Hilaire are the light properties of minerals. In the following tables, you will find the species that do fluoresce or phosphoresce under different lights.
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Fluorescence
This is a unique attribute of some diamonds that causes them to "glow" a typically bluish color when exposed to natural or man-made ultraviolet light (like a Black Light).
Fluorescence
A glow which emanates from certain diamonds when exposed to ultraviolet light. Strong fluorescence should be avoided, but faint fluorescence usually does not affect the appearance of a diamond.
Fluorescence in Diamonds
Fluorescence is an optical phenomenon in which a diamond's molecules absorb high-energy photons, re-emitting them as lower-energy, or longer-wavelength photons.
Long Wave/Short Wave UV Cabinet ...
Fluorescence, produced by ultraviolet light from the sun, by black lighting or other long-wavelength UV source, occurs in an estimated 35% of gem grade diamonds.
fluorescence A glow or color visible under ultraviolet light.
fortification The technical term for stripes of color in chalcedony.
Fluorescence
Diamonds that have Fluorescence (especially when you get into Strong Fluorescence) can have weird reactions to light and make a Diamond look foggy, cloudy or hazy (even if it has High Clarity and High Color).
Fluorescence
The luminescence of spinel shows considerable variation. Natural red and pink spinel show a strong red glow under long-wave UV light, and weaker under short-wave fluorescence. Dark blue spinel are completely inert under any radiation.
fluorescence
Fluorescence is property in which light (or other radiation) is emitted from an object. Many stones (including some diamonds) flouresce when exposed to ultraviolet light.
Fluorescence: When expose to ultraviolet light, a diamond may exhibit a more whitish, yellowish, or bluish tint, which may imply that the diamond has a property called fluorescence.
Fluorescence & Phosporescence
Flruoescence is the absorption of light of various wavelengths, including ultra-violet and infra-red, and its immediate re-transmission as other wavelengths.
Fluorescence
Temporary emissions of radiation at different wavelengths (color) struck by light waves - long or short wave ultraviolet light.
Fluvial
Mineral deposits from rivers.
Fluorescence: When exposed to ultraviolet light, an illuminating color that glows from the diamond surface, which usually doesn't affect appearance or quality.
Fluorescence: The ability of certain gems to glow when heated in low-light situations.
Fluorescence
Emission of visible light by a material such as diamond when it is simulated by higher energy X-rays, ultraviolet radiation or other forms of radiation. Fluorescence continues only as long as the material is exposed to the radiation.
Fluorescence: The strength and the color of the diamond when viewed under long-wave ultra violet light.
Comments: The additional identifying characteristics or features that are otherwise not represented on the report.
Fluorescence: LW, weak to inert; SW, weak to inert
Fracture: conchcoidal to splintery
Luster: vitreous to pearly or silky ...
Fluorescence occurs if a mineral emits visible light when illuminated by a light source such as Ultra Violet. ...
FLUORESCENCE - The process of a material emitting visible light when it is subject to ultraviolet light. For example, diamonds under ultraviolet light will often emit a visible light of a blue hue.
Fluorescence: An effect that is seen in some gem-quality diamonds when they are exposed to long-wave ultraviolet light (such as the lighting frequently seen in dance clubs).
Fluorescence: A property possessed by diamonds, fluorspar, uranium glass, sulphide of calcium, and many other substances, of glowing without appreciable rise of temperature when exposed to ultra-violet rays, cathode rays, X rays, etc.
Fluorescence: The mostly bluish glow of a diamond in high ultraviolet lighting conditions. Ratings: none, faint, medium, strong. Strong blue fluorescence may cause the diamond to appear oily in daylight.
Fracture: A crack in the stone.
Fluorescence
The emission of visible light when a gemstone is exposed to ultraviolet light. Used a method of distinguishing one gemstone from another and a natural gemstone from a synthetic gemstone.
FLUORESCENCE. The phenomenal quality exhibited by some gems of showing one colour in transmitted light and another in reflected light; fluorite, from which the word is derived, is a striking example.
Fluorescence The ability of some gems to appear a different color when viewed under ultraviolet light. If or not a stone has fluorescence is a valuable aid in gem identification.
Fluorescence - The property of changing the wavelength of radiation to one in the visible range; for example, the visible wavelengths emitted by a material when excited by invisible radiation (such as X-rays, ultraviolet rays or cathode rays), ...
Fluorescence
An effect in many gemstones mainly in diamonds that makes them glow in ultraviolet rays or light. Stones can fluoresce in a number of colors mainly in blue.
Fluorescence: Under different rays, ultraviolet, cathode, or x-ray some diamonds fluoresces different colors.
Fluorescence: Varying colour effects produced when materials are subjected to ultraviolet light.
Gallery: In a ring, the area below the setting. May be pierced, carved or scroll patterned.
fluorescence May also be referred to as luminescence. It is the energy or light produced due to a reaction of atoms when exposed to contacting incident light.
Fluorescence:
A glow, usually of a bluish color, which emanates from certain diamonds when exposed to ultraviolet light. Strong fluorescence should be avoided, but faint fluorescence usually does not affect the appearance of a diamond.
Fluorescence
Refers to the invisible wavelengths of light that become "visible" when exposed to ultraviolet radiation.
Fluorescence - When exposed to ultraviolet light, about half of all diamonds will display fluorescence. The amount of fluorescence determines the level to which it effects value.
Fluorescence
When exposed to ultraviolet light, a small percentage of diamonds fluoresce, or emit a blue or yellow light. Fluorescence is caused by trace elements, usually boron, that seep into the diamond when it is created.
Fluorescence: When exposed to ultraviolet light, the surface of some diamonds exhibit an illuminating bluish color.
Freshwater pearl: A pearl produced by a fresh water mollusk.
Girdle: A diamond's outer edge or periphery.
Fluorescence
The ability of some gems to glow when heated in low light.
Foiling ...
Fluorescence is the light that is emitted from a diamond when subjected to ultraviolet rays.
Fluorescence
Blue, yellow or white glow as seen on a diamond when viewed in ultra-violet light or strong sunlight.
Fracture ...
Fluorescence: The glow a diamond gives off when it is under a blacklight or other sort of long-wave ultraviolet light. Typically, it is not noticeable under normal lighting conditions.
FLUORESCENCE - The process of a material emitting electromagnetic radiation when it is subjected to radiation. In gemology, the usual influencing radiation is ultraviolet light and the emitting radiation is visible hued light.
Fluorescence...Temporary emission of radiations of different wavelength (color) by a substance struck by light waves usually long or short wave ultraviolet light.
Fluvial...Deposits from rivers.
Foliated...Made up of thin leaves, like mica.
Fluorescence
Glow with visible light caused when high energy rays pass through a substance. Visible in all rainbow colors with a domination of blue, white, green, pink and yellow in diamonds.
Four Cs ...
Fluorescence
Fluorescence is a characteristic that makes some diamonds appear to change color when they are exposed to the ultraviolet light that surrounds us every day in sunlight, and in the light produced by fluorescent bulbs.
Fluorescence is property in which light (or other radiation) is emitted from an object. Many stones (including some diamonds) flouresce when exposed to ultraviolet light.
Freshwater Pearl ...
Fluorescence
UV
Strong red to red-orange fluorescence (LW stronger than SW).
Fluorescence is an optical property associated with many gemstones. It occurs when various forms of electromagnetic energy (ultraviolet light, infrared light, or x-rays, for example) are absorbed by the host material, ...
Fluorescence: A property or effect seen in gem quality stones, such as diamonds, when they are exposed to ultra-violet light.
Fluorite: A soft mineral composed of calcium fluoride. It is found in many colors.
>Fluorescence
The property of a diamond, and of other stones, to change or to emit a form/color of luminescence when excited by invisible rays like X rays or ultraviolet rays (UV). While excited by UV light, the emitted color is generally blue.
UV Fluorescence
FTIR Spectra Analysis
Raman Spectroscopy - see this spectrograph illustrating the great divergence between resin-treated emerald and natural emerald ...
The fluorescence can be a bold green, orangish-red, or whitish blue, and vary in intensity. Fluorescence may be unpredictable because some gems will have no reaction to the UV light source.
The fluorescence of a diamond is examined in long-wave UV light (366 nm), compared with the fluorescence of calibrated stones, and described as follows:
nil - slight - medium - strong.
The fluorescences of the stone by ultraviolet light are extremely interesting. By short-wave (235.77 mm) UV light, the stone fluoresces a deep yellow, but we saw no phosphorescence on cutting off the radiation.
Blue fluorescence under short wave UV. Strongly dichroic. Named after the local (San Benito County) where it was first found (1907). This is the only site on earth where it has been found in place.
Photos
& Locals: ...
Fluorescence: Many but not all diamonds fluoresce blue, green, yellow or reddish in both long and short wavelength u.v. light. A stronger fluorescence is seen in most of these stones in long u.v..
X-ray fluorescence: is a non-destructive test to determine the thickness of various layers of metal on a part. Common elements measured are: copper, nickel, gold, silver, palladium and rhodium.
 See also: Color, Stone, Diamond, Jewel, Gemstone
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