.fa-star-o {
color: #cbb247;
background:
linear-gradient(#fff,#fff) right/14% 100%,
linear-gradient(#fff,#fff) left/14% 100% ,
linear-gradient(#fff,#fff) top/100% 14% ,
linear-gradient(#fff,#fff) top left/39% 35%,
linear-gradient(#fff,#fff) top right/43% 35%,
linear-gradient(#fff,#fff) bottom right/27% 48%,
linear-gradient(#fff,#fff) bottom left/27% 48%,
linear-gradient(to top left,#fff 50%,transparent 50%) bottom left/51% 24%,
linear-gradient(to top right,#fff 50%,transparent 50%) bottom right/51% 24%,
repeating-linear-gradient( -45deg, #e6c84b, #e6c84b 0.1em, #FFF 0.1em, #FFF 0.2em);
background-repeat:no-repeat;
}
<script src="https://use.fontawesome.com/eed659c9d4.js"></script>
<i class="fa fa-star-o fa-5x" style="font-size:100px;"></i>
<i class="fa fa-star-o fa-5x"></i>
<i class="fa fa-star-o fa-3x"></i>
<i class="fa fa-star-o fa-2x"></i>