I know you don't want to say what color it is (and don't say it so no one tracks it). But is it a nice color? It's not a XXX Rust or something, right?
Depending on what sort of $:gem ratio you're accepting ($1:500g is typical here, but for a while it was 1:650). It's up around Light Sprite price, so perhaps $50-$80 here, maybe on the higher end if the buyer really likes the color.