I don't think there is much of a size difference between male and female crested geckos. Males may have a bit of a bigger head but from what I remember (and I don't have my reference material handy unfortunately) weight/length isn't too much different between the sexes.
Big crested geckos would be any that are 50g or more..and are over 8" tailed. Average would be 5-8" (most likely 5" tailless as the tail is a little less than the length of the body from nose to vent)
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PHLdyPayne
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