Is it possible to draw a (coloured) border around the edge of a LaTeX symbol?

For instance, I would like to draw a black border around the edge of
a bigstar. So, something like this

Below a very short MWE

documentclass[tikz,border=10pt]{standalone}

usepackage{tikz}

usepackage{amssymb}



begin{document}

begin{tikzpicture}[scale = 0.5]

node [yellow] at (0,0,0) {$bigstar$};

end{tikzpicture}

end{document}

I searched for solutions, but I only get squared frames around basically anything, but not what I'm after. Any idea? Cheers

Basic

documentclass[preview,border=12pt,varwidth,dvipsnames]{standalone}

usepackage{contour}

usepackage{xcolor,amssymb}





contourlength{0.5pt} % thickness

contournumber{10} % number of replication



begin{document}

huge

contour{orange}{$bigstar$}

end{document}

Miscellaneous

The following example is not impossible but it takes much time and energy with PSTricks, let alone TikZ.

documentclass[preview,border=12pt,varwidth,dvipsnames]{standalone}

usepackage{contour}

usepackage{xcolor,amsmath}

usepackage{CJK}



contourlength{0.2pt} % thickness

contournumber{10} % number of replication



begin{document}

huge

begin{CJK}{UTF8}{min}

begin{center}

contour{orange}{気持ちは}

end{center}

[

contour{red}{$sqrt{x^2}$},

contour{green}{$not=$},

contour{blue}{$x$}

]

begin{center}

contour{cyan}{言い表しにくいです}

end{center}

end{CJK}

end{document}

I guess the most simple-minded approach would be to draw the node in black and a bit larger underneath. Notice that you need to add transform shape for the scale=0.5 to affect the node.

documentclass[tikz,border=10pt]{standalone}

usepackage{tikz}

usepackage{amssymb}



begin{document}

begin{tikzpicture}[scale = 0.5,transform shape]

node [black,scale=1.2] at (0,0,0) {$bigstar$};

node [yellow] at (0,0,0) {$bigstar$};

end{tikzpicture}

end{document}

contour, as suggested in this answer does basically the same. However, TikZ also has star symbols built in. Why not use those?

documentclass[tikz,border=10pt]{standalone}

usepackage{tikz}

usetikzlibrary{shapes.geometric}



begin{document}

begin{tikzpicture}

node [star,draw,fill=yellow,minimum size=5mm,star point ratio=2]{};

end{tikzpicture}

end{document}

The crucial advantage is that you have all sorts of parameters that you can adjust to obtain the star you really want (a so-called super-star ;-), see the pgfmanual on p. 701.