Talk:Crystallographic defects in diamond

message: Agthorr June 15, 2006:
This is a great article.  I've learned a lot, but I still have some unanswered questions.  I'm hoping some of the authors of the article might be able to find answers for them (or point me in the right direction) and update the article with the additional information.
I've been trying to better understand the blue fluorescence seen in many available-to-the-consumer diamonds.  I know its caused by the absorbtion of UV light, exciting an electron, which shortly thereafter radiates blue light.  The description of the N3 and N2 centers state that they absorb UV light; are these the centers that cause fluorescence?  Or is it caused by a different kind of defect?
I've heard many conflicting reports about the "oily" or "milky" look of fluorescing colorless diamonds.  Everyone seems to agree that very strongly fluorescencing stones have the oily look and that mildly fluorescing diamonds are fine.  For moderate and strong fluorescence I find a lot of disagreement.  Some people swear up and down that all such stones appear oily.  Some people swear up and down that all such stones appear oily when viewed under significant UV lightly (e.g., daylight).  Some people (such as this GIA report) state that *only* very strongly fluorescencing diamonds exhibit the oily or milky appearance.  Finally, other people state that the oily or milky look depends on the particular stone, and some strongly fluorescing stones have it, while others do not.
Based on what's in the article now, I get the sense that a milky look could be the result of many colorless defects (such as A or B1 centers) that don't alter the color of the stone, but nevertheless reduce transparency.  Is that possible?  Do A or B1 centers lead to translucency (as opposed to transparency)?
:Milky, cloudy, or oily appearance are all things that can occur independently of fluorescence. However, in a certain percentage of very strong blue fluorescent stones (3% according to the GIA) one or more of these features appear under sources rich in uv (e.g., daylight) but not in uv-free lighting conditions. To what extent, if any, the same phenomenon may be visible in stones of lesser fluorescence (for example, under very intense filtered uv light) is something on which I have no information, although it's obviously a question that needs answering. Zyxwv99 (talk) 19:23, 6 May 2013 (UTC)
thread_title:  Fluorescence and other questions 

message: This article has been removed from the Ga list as it has failed WP:WIAGA criteria 2b. Feel free to renominate the article once these issues have been addressed. Tarret 23:42, 23 October 2006 (UTC)
thread_title: Delisted GA

message: After over a month on the list, I have failed this for two reasons:
*Uncited statements. Some serious ones, which I'll list later. In an article that cites eighty-two scholarly papers published in reputable scientific journals, so much that my printed copy requires three pages at 10 points to show almost all of them, there is no excuse for this).
*General prose sloppiness. There are missing pronouns and articles all over the place, from non-native English-speaker edits, I'll venture. Some paragraphs seem to be disconnected collections of thematically related sentences. And the overall organization within sections is inconsistent and disorganized. I also feel it's a little heavy on the jargon, even granted that this is a fairly technical subject.
I will go into specifics later tonight on the subpage. Daniel Case (talk) 23:38, 30 January 2009 (UTC)
thread_title: Failed 2009 GA nom

message: Has somebody checked multiple sources on this? Zyxwv99 (talk) 19:17, 6 May 2013 (UTC)
replies: text: N3 has a short luminescence lifetime (nanoseconds, not microseconds), and the intensity is not strong enough to impart color under usual illumination (sunlight or office light). N3 contributes to color only via absorption. N3 concentrations are usually low, and its absorption starts roughly from its zero-phonon line at 415 nm and extends into UV, i.e. almost beyond the spectral sensitivity of human eye. However, N3 is always accompanied by N2, which absorbs green and results in straw-yellow color in a small percentage of diamonds. Materialscientist (talk) 01:05, 7 May 2013 (UTC)
thread_title:  N3 does not induce color on its own? 

message: Substituted at 12:30, 29 April 2016 (UTC)
thread_title: Assessment comment

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