v • d • e This article is within the scope of WikiProject Gastropods , a collaborative effort to improve the coverage of Gastropods on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks. Calcareous Concretions
Would it be a good idea to have a separate article on calcareous concretions? Not only does the pearl article have an entire paragraph devoted to the largest "pearl" ever found even though it isn't really a pearl at all, but there is also an entire paragraph on conch pearls which are also calcareous concretions and not true pearls. Besides, there are other types of calcareous concretions or non-nacreous "pearls" such as melo melo pearls and scallop pearls, so there might be sufficient content to justify its own page.
And if the consensus is that calcareous concretions deserve their own page, what should it be called? In my opinion, "calcareous concretions" is too technical and intimidating, but "non-nacreous 'pearls'" might be misleading. Thoughts? SirenDrake 05:49, 7 October 2007 (UTC)
It would be good to include a separate article on calcareous concretions. At the moment bits and pieces are strewn about the main article in ways that do not fit, and may be confusing. The following paragraph is a fine example.
One other kind of gemstone-quality pearl is created by a large sea snail or marine gastropod. These large, deep pink pearls are not very "pearly" although they can have a good luster. They grow between the mantleand the shell of the queen conch or pink conch, Strombus gigas from the Caribbean. These conch pearls occur naturally, although they are very rare. They are a by product of the conch fishing industry.
This is in the first section under pearl. While it is technically correct, it does not really fit into the section. Conch pearls are non-nareous, and if they are to be mentioned we should also mention melo melo, tridacna, scallop, penn, abalone, etc. JPShepherd 15:16, 18 October 2007 (UTC)
- Please note that this discussion on 'calcareous concretions' is rather out-of-date as the GIA has fallen into line with most other gemmological authorities and now refers to non-nacreous pearls as pearls rather than 'calcareous concretions'. It was always a rather artificial distinction as the definition of 'pearl' and 'calcareous concretion' appear to be indistinguishable. —Preceding unsigned comment added by 90.195.137.125 (talk) 22:42, 2 October 2008 (UTC)
This is not necessarily the case. The referrenced article shows the opinion of one individual at GIA, it does not indicate an official change in policy. Quote from article: "Kenneth Scarratt (GIA Thailand) described the wide variety of mollusks that can produce pearls and argued that the term "pearl" should be applied to both nacreous and non-nacreous materials, such as conch pearls."JPShepherd (talk) 18:12, 12 October 2008 (UTC)
Policy has indeed changed at both GIA and CIBJO who have both been referring to Conch (and various other mollusc) pearls as 'pearls' for a while now.Michael314159 (talk) 04:03, 26 October 2009 (UTC) Just had a thought: isn't it possible for a nacreous-shell-bearing mollusc to produce a NON-nacreous pearl? I seem to recall that such items are mentioned occasionally in gemmological texts as an afterthought but I don't have a reference handy. I think that in such cases the pearl formation is incomplete or the pearl sac has formed from the wrong type of cell or something. Anyone have more info or a suitable reference? This could affect the 'calcareous concretion' and 'definition of a pearl' sections.Michael314159 (talk) 04:25, 26 October 2009 (UTC)
Sure. The Penn pearl would be a good example. The pearl may have nacreous parts, or the pearl may or may not be nacreous. I believe it depends on the location of pearl development within the shell. JPShepherd (talk) 23:54, 27 October 2009 (UTC)
Illustration
The picture used as illustration ("White pearls strung on a necklace") features imitation pearls. They are not real pearls. Effisk 21:42, 2 December 2006 (UTC)
myth?
No way. >Eventually<, maybe, but not anytime soon. 65.41.47.6 17:51, 29 April 2006 (UTC)
.
Pearls can be manufactured by hand. In Manacor, Mallora (Spain) there are pearl factories that makes 'Majorcan pearls'. These are made with a glass centre, onto which the layers are added one by one. The pearls are polished extensively between layers to remove any imperfections. As far as I remember, the material for the layers consists of such things as fish scales...
Why no picture of an actual pearl, alone or in the context of jewelry? Surely someone reading this owns both a pearl and a digital camera.--Joel 22:19, 10 May 2005 (UTC)..
- I came here to say the same thing... --RealWingus 06:05, 13 August 2005 (UTC)
reverted bad edit
I reverted the edit by Nameneko 19:31, May 10, 2005. I changed the unit back to cm instead of mm. It is impossible for a 7mm oyster to produce a 10mm pearl. Kowloonese 22:38, August 19, 2005 (UTC)
Nonsensical sentence and Titian
Anyone know what this is supposed to mean? Also, why are Tahitian pearls known as Titian pearls? There's no explanation anywhere, and that makes it seem to me that the link to Titian is wrong. FireWorks 19:11, 29 December 2005 (UTC)
Npaspaley 12:32, 15 February 2007 (UTC)The concept that the colder the water - the higher the luster - is not correct. Luster is dependent primarily on the quality of the nacre tiles produced by particular pearl oysters. If the quality is fine, and there are thousands of thin layers of nacre, the luster will be fine. However, the relationship between cold water and luster can best be described as follows: it is a fact that a pearl oyster will produce finer layers of nacre during the cold winter months than in hotter summer months. It is NOT correct that Akoya pearls in Japan's cold water have a higher luster than south sea pearls from tropical warm waters. When harvested, south sea pearls generally have a much higher luster than freshly harvested Akoya pearls. Akoya pearls have quite poor luster when harvested, and it is the polishing process which delivers a high luster. Artificial luster can be as shiny as the polishing process is intended. e.g. even mirror finishes can be achieved through modern polishing processes. However, this is not the natural luster of pearls in nature.Npaspaley 12:32, 15 February 2007 (UTC)
Animal rights
There should be an Animal Rights section discussing the fact that pearl oysters are animals too, and have rights too. 201.23.64.2 00:46, 2 June 2006 (UTC)
Symbolism
Pearls are a beautiful thing created by a reaction to suffering. For this reason it is sometimes used symbolically. --Zerothis 02:44, 31 August 2006 (UTC)
Information wrong for subject
The subject of this article should be on the middle English poem Pearl and not on actual pearls.
Grain of sand
I have impetuously substituted the idea that a parasite acts as the seed for the pearl, as per this page. But is this just a theory? I'm not sure. This page is perhaps more reliable.--Shantavira 12:28, 18 September 2006 (UTC)
Vinegar?
I opened a Snapple bottle today, and it had a 'Random Real Fact' that pearls dissolve in vinegar. Maybe that's where the wine thing came from too-wine can turn to vinegar-can anyone verify this? -Rmeskill 14:58, 29 September 2006 (UTC)
Color
I think we need a short explaination of what causes different color pearls to be produced. K e rowyn Leave a note 08:57, 22 October 2006 (UTC)
student research
this page does not have stuff about how pearls are retrived!
Needs to be added!
Resource for Prl locations and types
Came across this table on the GIA site, and thought editors of this page might find it useful. Gems & Gemology data depository: Expanded localities for cultured pearls, natural pearls, and calcareous concretions. Cheers. SauliH 21:41, 7 December 2006 (UTC)
December 2006 (UTC) Found a pearl the size of a small marble in my oyster stew.I assume, having been "cooked',its only value is as a novelty?Natural Pearl Edit
While an expansion of natural pearling is welcomed the recent edit was very non-NPOV, and required extensive editing. The article now needs further copyediting and expansion to remove duplicate information, as well as some citation work. SauliH 18:24, 16 January 2007 (UTC)
Page to be merged with Pearl
I have been working on the pearl page (and organizing it as well as will add more info on sp
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