Watch out for pulchripes. From experience... we bought a beautiful female of 14cm, huuuge carapace and abdomen and underside looked just like female. She molted recently, now 15cm, not a mature male, but there's no spermatheca on the molt and just a flat line. So it's male, unless the spermatheca didn't molt off and still inside her..but the molt is complete and confirms male..
So just wait for a molt..