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.star-icon {
    color: #ddd;
    font-size: 18px;
    position: relative;
}

.star-icon.full:before {
    text-shadow: 0 0 2px rgba(0,0,0,0.7);
    color: #FDE16D;
    content: '\2605'; /* Full star in UTF-8 */
    position: absolute;
    left: 0;
}

.star-icon.half:before {
    text-shadow: 0 0 2px rgba(0,0,0,0.7);
    color: #FDE16D;
    content: '\2605'; /* Full star in UTF-8 */
    position: absolute;
    left: 0;
    width: 50%;
    overflow: hidden;
}

@-moz-document url-prefix() { /* Firefox Hack :( */
  .star-icon {
    font-size: 18px;
    line-height: 24px;
  }
}

<?php
//* Do NOT include the opening php tag shown above. Copy the code shown below.

add_filter( 'genesis_post_info', 'jmw_add_star_rating_to_post_info' );
function jmw_add_star_rating_to_post_info( $filtered ) {

    $star_rating = get_post_meta( get_the_ID(), 'star_rating', true );

    if( !empty ( $star_rating ) ) {
        $stars = '';
        for( $i = 1; $i < 6; $i++ ) {
            $class = '';
            if( $i <= $star_rating ) {
                $class = "full";
            }
            else if( $i < $star_rating + 1 ) {
                $class = "half";
            }
            $stars .= sprintf( '<span class="star-icon %s">&#9734;</span>', $class);
        }
        $filtered = sprintf( '<span class="star-rating">%s</span>%s', $stars, $filtered );
    }

    return $filtered;
}