This fonts are authors' property, and are either shareware, demo versions or public domain. The licence mentioned above the download button is just an indication. Please look at the readme-files in the archives or check the indicated author's website for details, and contact him if in doubt. If no author/licence is indicated that's because we don't have information, that doesn't mean it's free.
Version 2. 3 15SEP2018: I have begun adding diacritics, but they must be made subtractively to fit into the designs. I delete the diamonds around them which lends accented letters an open-topped appearance. This method is experimental but seems readable enough to me. . . * Inspired by a comment by jonrgrover. I built diamonds sized according to the Fibonacci series, then made a design out of them. The design was then carved away and modified to make the glyphs you see here. I used the members 1, 2, 3, 5, and 8. These sizes proved most feasible to work with in this sort of arrangement. I gave the terminals a flared appearance which I think makes the glyphs' outlines look slightly Celtic. The design makes me think of beach sand and things found on the beach - shells, pretty rocks, and so on. * This font is not to be confused with "Diamondized ". :D