Talk:Carat (purity)

message: I think this paragraph should be removed and replaced with a link or reference. To just have the whole excerpt from a legal document copy-pasted, especially if it's this voluminous, seems unacceptable. Or else, have the rest of the entry much more comprehensive (e.g. list the most common gold alloys etc.), so that this huge/bloated copy-pasted paragraph doesn't look too out of place. For instance, information like this one would be perfect for this article: http://www.utilisegold.com/jewellery_technology/colours/colour_alloys/  —Preceding unsigned comment added by 213.243.137.56 (talk) 13:18, 4 April 2009 (UTC)
thread_title:  "Title 16: Commercial Practices PART 23—GUIDES FOR THE JEWELRY, PRECIOUS METALS, AND PEWTER INDUSTRIES" 

message: Can someone double-check the data for Russia/former USSR? The typical value cited in the article is 14 karat, and I'm pretty sure that it was and is higher.  —Preceding unsigned comment added by 24.4.205.124 (talk) 23:38, 28 September 2007 (UTC)
thread_title:  International 

message: 14KP I was told this was plumb gold very pure. I've never heard of this, does any one know?****
Carmen  —Preceding unsigned comment added by 70.234.201.86 (talk) 01:39, 16 May 2008 (UTC)
thread_title:  initials for gold jewelry 

message: I found another Web site that also described 14-carat gold as 58.5 percent pure; my calculator's telling me it's 58.33 percent. It's not a huge discrepancy, but is one number accepted by industry and one by mathematicians? --Thatnewguy (talk) 16:44, 20 August 2008 (UTC)
replies: text: It's because you have to solve for karats, not percentage. If you assume you have a gold alloy that has .585 grams of gold (as is claimed) and has a total mass of 1 gram and solve it for X in the equation on the page, you get X=14.04. Obviously, this is rounded to 14 karats for conveinience. --70.184.239.162 (talk) 23:43, 9 September 2009 (UTC)
thread_title:  14 carat discrepancy 

message: The text says, "As a measure of purity, one carat is \tfrac{1}{24} purity by mass."  But the formula shows purity MULTIPLIED by 24, not divided by 24.  Is this intentional?  --Discostu5 (talk) 22:19, 4 October 2009 (UTC)
thread_title:  Karat / carat as a measure of purity? 

message: The term "karat" is the correct term when measuring gold purity, while "carat" is actually a term to measure the weight of precious stones. 1 Carat = 200 milligrams.  —Preceding unsigned comment added by 41.247.103.64 (talk) 11:01, 16 May 2010 (UTC)
replies: text: This seems to be a US thing.  In the UK, Europe, and most other places, "Carat" is used for gold purity.  In fact, I had never heard of the "karat" spelling until I came to this page today.  Astronaut (talk) 17:07, 1 April 2011 (UTC)
thread_title:  Page's definition is wrong 

message: In the distant past, different countries each had their own carat, roughly equivalent to a carob seed. In the mid-16th century, the Karat was adopted as a measure of gold purity, roughly equivalent to the Roman siliqua (\tfrac{1}{23} of a golden solidus of Constantine I). As a measure of diamond weight, from 1575, the Greek measure was the equivalent of the Roman siliqua, which was \tfrac{1}{24} of a golden solidus of Constantine; but was likely never used to measure the weight for gold.[3]
is it 1/23 or 1/24?  — Preceding unsigned comment added by 188.120.133.137 (talk) 10:03, 6 July 2011 (UTC)
thread_title:  The second paragraph in "Derivation" contradicts itself. 

message: Therefore, 24-Karat gold is fine 99.9 ??
Therefore nothing. Per the formula 24 is 100.00%.
Of course you then go on the discuss tolerancing and legalities, but it is nonsense to say 99.9 follows from the definition.  — Preceding unsigned comment added by 99.56.162.2 (talk) 14:37, 25 February 2012 (UTC)
thread_title:  therefore 

message: What is this chart supposed to be saying?  Surely all the gold in china isn't 24k.  — Preceding unsigned comment added by 99.56.162.2 (talk) 14:44, 25 February 2012 (UTC)
thread_title:  International caratages 

message: I don't feel the article explains why or how 24 became the number indicating the highest purity.  It was the weight of a specific coin in carets? How does that turn into a number and term for purity? Some of the comments here mention alchemists which sounds like a reasonable source for the number, because the might have been into numerology and liked the number 24... but where the 24 came from is the only reason I came to this page, and my curiosity has not been satisfied, so I would really appreciate if someone could add some solid information about that.  — Preceding unsigned comment added by 76.195.82.81 (talk) 15:24, 5 December 2012 (UTC)
thread_title:  Why 24 

message: It says that karat is to measure the purity of Gold, however, I believe it is also used to measure other things, such as diamond and metals other than Gold. Please correct me if I am wrong, but I believe this is correct.
2001:5C0:1400:A:0:0:0:112D (talk) 17:00, 14 February 2014 (UTC)
thread_title:  Karat/carat definition