There is no gem, Nabooti jewel, at the Safari.
Take seven pictures for Zeke (the seven animals may take awhile to show themselves). Zeke will give you a miner's hardhat, which will let you enter the Diamond Mines.
how do you get the white gem on poptropica nabooti diamond mines
in the mines
You buy a camera at Nabooti to use on the Safari.
you get the blue gem
its in the tomb in giza.
In the Diamond mines
nothing
There are no jewels on the Safari. You get the hardhat for the Diamond Mines.
Animal pictures are taken at the SAFARI on Nabooti Island. (see related questions)
Swap the nugget at Nabooti to get a camera for the Safari.
Find the other gems.
you get a gem in the mine