\documentclass{standalone}

\usepackage{tikz}
\usepackage{shapes}

\begin{document}
\begin{tikzpicture}
  \begin{scope}
    \clip(1,0)--++(3,3)--++(-3,3)--++(-3,-3)--cycle;
    \grid66{(-2,0)}
  \end{scope}
  \diamond{teal}{(1,1)}
  \diamond{teal}{(0,2)}
  \diamond{teal}{(-1,3)}
  \diamond{teal}{(0,4)}
  \diamond{teal}{(1,5)}
  \diamond{teal}{(2,4)}
  \diamond{teal}{(3,3)}
  \diamond{teal}{(2,2)}

\end{tikzpicture}
\end{document}