I'm guessing you have a beautiful pied female there but I could be wrong on the sex. At 10 weeks, how vocal is he or she? Has your bird made ANY attempts to whistle or chatter a lot? If so, it's about a 90% chance you have a male.
It looks like you have a cinnamon pied cockatiel because of how light the grey feathers are. I have a cinnamon pied cockatiel myself, and she looks very similar to yours. Your cockatiel looks even lighter than mine though, but I think the cinnamon will vary in every cockatiel.