graph-tool logo with TikZ

\documentclass{article}

\usepackage{tikz}

\begin{document}

\centering
\begin{tikzpicture}

\definecolor{gtRed}{RGB}{85,0,0}

\def \n {6}
\def \radius {2cm}

\node[circle,draw=black,very thick,minimum width={\radius*2}] at (0,0) { };

\foreach \i in {1,2,...,\n}
{
    \node[circle,draw=black,very thick,fill=gtRed,minimum width={(\radius)/3}] (D\i) at ({360/(\n) * (\i - 1)}:\radius) { };
}

\path[draw=black,very thick] (D2) edge[bend right=30] (D6);
\path[draw=black,very thick] (D3) edge[bend right=30] (D6);

\end{tikzpicture}

\end{document}