Link Visited Color

You can try the following CSS at GD > Design > CSS

/* button hover & button focus */
.dt-btn:hover,
button:hover,
input[type=button]:hover,
input[type=reset]:hover,
input[type=submit]:hover,
a.geodir_goback:hover,
p.edit-link:hover,
.reply .gd_comment_replaylink .comment-reply-link:hover,
#buddypress form#whats-new-form input[type=submit]:hover,
#buddypress .standard-form div.submit input:hover,
#buddypress .comment-reply-link:hover,
#buddypress button:hover,
#buddypress div.generic-button a:hover,
#buddypress input[type=button]:hover,
#buddypress input[type=reset]:hover,
#buddypress input[type=submit]:hover,
#buddypress ul.button-nav li a:hover,
#buddypress input[type=submit]#notification-bulk-manage:hover,
#reviewsTab #comments .comment-reply-link:hover,
.wpl_reviews #comments .comment-reply-link:hover,
.gdbp-wrapper-reviews #comments .comment-reply-link:hover,
.dt-btn:focus,
button:focus,
input[type=button]:focus,
input[type=reset]:focus,
input[type=submit]:focus,
a.geodir_goback:focus,
p.edit-link:focus,
.reply .gd_comment_replaylink .comment-reply-link:focus,
#buddypress form#whats-new-form input[type=submit]:focus,
#buddypress .standard-form div.submit input:focus,
#buddypress .comment-reply-link:focus,
#buddypress button:focus,
#buddypress div.generic-button a:focus,
#buddypress input[type=button]:focus,
#buddypress input[type=reset]:focus,
#buddypress input[type=submit]:focus,
#buddypress ul.button-nav li a:focus,
#buddypress input[type=submit]#notification-bulk-manage:focus,
#reviewsTab #comments .comment-reply-link:focus,
.wpl_reviews #comments .comment-reply-link:focus,
.gdbp-wrapper-reviews #comments .comment-reply-link:focus {
    color: #dead39;
}