Talk:Carat (mass)

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I removed "(spelt karat in the U.S., to distinguish it from the unit of mass above)" because (a) I've never seen that spelling, (b) the OED states that it is an obsolete late Middle English spelling, without any note that it's still used (or ever has been used) in the US.

It is the only usage for a unit of purity in the U.S. I have ever seen. Consult a reputable American English dictionary (such as Merriam-Webster). And in fact, the OED states that it is "obs. exc. U.S." which means obsolete except in the U.S. and even gives several examples of its use in U.S. mass-market periodicals. --Grouse 13:48, 23 Nov 2004 (UTC)

[edit] Connection to Troy Measure

It was originally connected to the Troy system, but how many grains were in one carat?