I will first off say that if you want to tell the sex of your keet, for sure, take your parakeet to an avian vet and they'll be perfectly capable of telling you the sex, for a price of course. For free, you can do it at home, (or at the pet store) but often you have to wait until they're at least 4 months old. (You can't for sure tell their age on their own, because once they've hatched, they won't actually leave the nest until they're about the same size as their parents. Although, one way to determine if they're under a year old is by the bars on their heads, the closer the bars are to their eyes, the younger they are. Once the bars reach the bottom of their skull, (the nape of their neck) this method isn't useful anymore to determine age, because then they're at least a year old by this point.)
Now for the information you're actually looking for: All parakeets have something called a cere right above their beaks. They look like nostrils because there are two little holes. If the cere is brown, tan or variant of those colors, it means that your parakeet is a female. If the cere is blue, your parakeet is a male. If the cere is white, give it some more time to judge it's sex in this way (and by more time, I'm referring to months). Alternatively, if you're too impatient, you could always take it to a vet to have its sex determined there.
By there noses. A males nose is blue. A female is pink or a light peach
Both male and female emus have blue on their necks. It is impossible to tell the male and female apart by appearance alone.
a male parakeets cere is dark (dark purple blue ect.)
If this is a reference to emus, both male and female emus have blue on their necks. It is impossible to tell the male and female apart by appearance alone.
the blue one is male and the others female
Both male and female emus have blue on their necks. It is virtually impossible to tell the male and female emu apart by their appearance.
A male is blue coloured above there nose, females have a brownish colour.
If its bright purple, its most likely a male. However if it is a light purple, it may be a female. Although keep in mind that if your keet is under a year old, then its hard to tell. It may very well be male or female... in which case only time will tell.
no both have blue eye sacks the male has brownish blak eyes and the female red
The most obvious way to determine whether a kookaburra is male or female is that the male has blue wing-tips and a deeper blue on his tail. Females tend to be stockier and more heavyset, but this is not an obvious difference.
If he/she has a BLUE nose it's a boy. If he/she has a BROWN nose its a girl. When it's a PINK or a LIGHT nose it mean its still a baby so you cant really tell yet
to tell you look at there nostrill if it is blue or purple