Sometimes it's hard to tell Giants just by their growth rate. If the breeder has proven the SG parent to be a SG then it should be a Giant. Do you know how big the SG parent is? Unfortunately, some of the Super Giants that have been sold only turn out to be Giants (happened to us) so if you don't think yours is a Giant then it's possible that the SG parent was only a Giant. But for $20 is a gorgeous gecko even if it's not a Giant!