I have heard of 'green' (self-archiving in a repository) and 'gold' open access (immediate open access in a journal), but what is 'diamond' open access? How does this differ from green or gold open access?
Diamond open access is like gold, in that the article is immediately open access in the journal, and nobody has to pay to read it. However, in gold open access, the author (or their institution or funding agency) normally has to pay a publication fee to get the article published. In diamond open access, they don't have to pay, so the process is completely free of charges to both authors and readers.
See http://www.jasonmkelly.com/2013/01/27/green-gold-and-diamond-a-short-primer-on-open-access/
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6Some through in-kind support and donated labor. Some (see e.g. the Open Library for the Humanities) through pass-the-hat support from libraries and relevant university departments. Some grants. Some advertising. Some a mix of the above strategies. There's lots of ways. – D.Salo Apr 12 '16 at 2:45
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4You could also phrase it this way: Diamond is like green, but with peer review. – David Ketcheson Apr 12 '16 at 9:21
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3See also this article by Bob Rosebrugh on "Experience with a Free Electronic Journal::Theory and Applications of Categories", a diamond open access journal: Notices of the AMS, January, 2013. : dx.doi.org/10.1090/noti930 ."The word “free” in the title intentionally has two meanings: free of cost and in a state of liberty. The thesis of this note is that mathematics journals should be free and that this can be achieved much more easily than might be supposed. " – Ronnie Brown Jan 13 '17 at 15:50
