Gentium font with cyrillic

Question

There is a way, to use Gentium font with cyrillic text?

I tried so:

% !TeX encoding = UTF-8
% !TeX TS-program = xelatex
\documentclass[12pt,a4paper]{article}

\usepackage{fontspec} % loaded by polyglossia, but included here for transparency 
\usepackage{polyglossia}
\setmainlanguage{russian} 
\setotherlanguage{english}
\newfontfamily\russianfont[Script=Cyrillic,]{Gentium}


\begin{document}
    Test, \textbf{test} 

    Тест, \textbf{тест}
\end{document}

but I have no bold in this case:

Another try:

% !TeX encoding = UTF-8
% !TeX TS-program = xelatex
\documentclass[12pt,a4paper]{article}

\usepackage{fontspec} % loaded by polyglossia, but included here for transparency 
\usepackage{polyglossia}
\setmainlanguage{russian} 
\setotherlanguage{english}
\newfontfamily\russianfont[Script=Cyrillic,BoldFont={Gentium Basic Bold}]{Gentium}


\begin{document}
    Test, \textbf{test} 

    Тест, \textbf{тест}
\end{document}

So now I have bold version of font, but cyrillc don't work:

Answer 1

The Gentium font, as currently distributed, has no boldface version. The Gentium Basic font has no Cyrillic, so you're stuck.

You can fake the boldface, though.

\documentclass[12pt,a4paper]{article}

\usepackage{fontspec} % loaded by polyglossia, but included here for transparency
\usepackage{polyglossia}
\setmainlanguage{russian}
\setotherlanguage{english}
\newfontfamily\russianfont[
  Script=Cyrillic,
  BoldFont={Gentium},
  BoldFeatures={FakeBold=4},
]{Gentium}


\begin{document}
    Test, \textbf{test}

    Тест, \textbf{тест}
\end{document}

For a very limited usage of boldface this may be regarded as acceptable.