i had no idea it was possibleAt that size, you can probably sex them just by color:
Lampropelma sp. 'Borneo' sexual dimorphism
Lampropelma sp. 'Borneo' males start showing tarsus and metatarsus coloring early as two inches. 2" Male Leg I tarsus and metatarsus 2" Female Leg I tarsus and metatarsus By 3" the males other legs have gained the colors......... 3" Male 3" Female When the...arachnoboards.com
I can't check since it's VEERY well hidden but it was sold as confirmed female. I'll contact the seller if I ever sex it as male. Thank you very much