Database of luminescent Minerals


DIAMOND


Chemical Formula: C

Familly: Native elements

Status: IMA-GP

Crystal System: Isometric

Mineral for Display: Yes


Luminescence:


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Blue StrongOften
Other colors LW:                                                                 
Bluish White , Yellowish White , Pinkish White , Pale Yellow , Yellow , Dark Orange /Tawn , Red , Salmon pink , Greenish Yellow , Green , Blue , Greenish white , Yellowish ,

Daylight Picture


Diamant, Congo;
Photo et col. G. Barmarin

Long Waves Picture (365nm)


Diamant UVLW (superbright 2000), Congo;
Photo et col. G. Barmarin

 

Galerie de photos:

            ...

     To the gallery (14 images in the gallery)


Phosphorescence (in the common meaning of the term) seen by naked eye:


UV Type Color Intensity Observation Frequency
Long Wave (365nm): Bluish White StrongOften
Short Waves (254 nm): Red StrongVery rarely
 

Thermoluminescence: Yes


Comments:


Probably the earliest phosphorescent mineral known after exposition to the sunlight.

In 1663, Robert Boyle first noted the triboluminescence of diamond when broken.

Mrs Kunz wife of the well known mineralogist possessed a prodigious diamond  that was phosphorescent in the dark for some minutes after just being exposed to a small pocket electric lamp.

Kunz in 1895 attributed the fluorescence and phosphorescence that is shown by some diamonds to the presence of a hypothetical hydrocarbon, for which  e gave the name ' tiffanyite '. 

About One diamond upon four is luminescent.


Main Activator(s) and spectrum:


Most Common Activator: N (Nitrogen)

Other activators:            B (Boron) ,

Peaks in the spectrum (nm):

N3 center: 442, 507 nm
H3 center: 520nm 
A-band center: 452nm
N3 center: 415, 428, 439, 452, 731nm


Spectrum: Michael Gaft, Petah Tikva, Israel. Plot: Institute of Mineralogy, University of Vienna, Austria, with permission of the authors.

            ...

  To the spectrum gallery (12 spectra in the gallery)


Comments on activators and spectra:


Luminescence of diamond is related to various defects in its structure, almost always related to N (Nitrogen) atoms (The atomic radius of C and N are nearly equal to 0.77 angströms).

N3 center: color and luminescence center attributed to 3 Nitrogen atoms bounded to the same Carbon atom or a vacancy.  The luminescence spectra of this center is associated with a large peak at 440-450nm with a fine structure (peaks around 415, 428, 438 and 451nm) a lifetime: 30-40ns and an absoption energy of 2,985eV but other centers (Al imputity for exemple) contribute to this spectrum even if it is not possible aboce 170K to discriminate their contribution.

 

H3 and H4 centers: two Nitrogen atoms coupled with a vacancy in two different configurations. Absorption energy: 2,463eV. Decay-time: 15-20ns

 

S1 center: a combination of one vacancy with one Nitrogen atom

 

S2 center: a combination of two vacancies with one Nitrogen atom

 

S3 center: a combination one vacancy with several Nitrogen atom

 

H3, H4, S2 and S3 centers are characterized by broad bands at 520-545nm with very weak lines at 489nm and 523nm (S2), 498nm (S3) and 503nm (H3)

 

A-band at 480nm observed in natural diamond of type I

A-band with a maximum at 440 nm in natural diamond of type II (low Nitrogen diamonds)

 

Some  blue diamonds exhibit a remarkable red phosphorescence such as Hope or Wittelsbach-Graff (both of Indian origin) and Blue Moon (South Africa Cullinan Mine);

All natural, untreated type IIb blue diamonds (diamond without Nitrogen but containing some uncompensated Boron) show a phosphorescence with two emission bands: one at 660 nm and another at 500 nm but for those three diamonds, unlike usually, it is the blue that decreases more quickly than the red causing this magnificent red phosphorescence.

Type IIb diamonds with orange-red phosphorescence are more commonly originated in India or Venezuela but not in the case of the blue Moon coming from the Cullinan Mine in South Africa where diamond are normally found with a more typical brief bluish phosphorescence.

After exposure to short-wave ultraviolet light, the Blue Moon display orange-red phosphorescence (around 660nm) that remain visible for up to 20 seconds. (see bibliography: Eloise Gaillou, Gems and Gemmology, Winter 2014)


Best Locality for luminescence(*):


(*)Data are not exhaustive and are limited to the most important localities for fluorescence


Bibliographical Reference for luminescence:



Luminescence Reference on internet:



Mineralogical Reference on internet:


  http://www.mindat.org/show.php?name=Diamond

  http://webmineral.com/data/Diamond.shtml

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Note: While all due attention has been paid to the implementation of the database, it may contain errors and/or accidental omissions. By nature, the database will always be incomplete because science always evolves according to new analysis.
A request providing no result means only that no such reference exists in the database, but it does not mean that what you are looking for does not exist, just not to our knowledge. If you think you have found an error or omission, please let us know via the contact page being sure to cite the source of information.

 


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