I don't think there's a pattern. This person created it -
https://ahhhquilting.blogspot.com/20...4-squares.html
inspired by this quilt -
http://www.littlemissshabby.com/2011...cy-quilt-info/
inspired by this free pattern from Moda -
http://www.unitednotions.com/fp_natures-notebook.pdf
(And I got there by doing an image search for squares and diamonds)