It isn't the pyramid, but the Sphinx that you climb up, to put the Moonstone into the ring.
(see the related question)
Go 2 the top of the pyramid and use the moonstone
you get the blue gem
You complete it and get the jewel
You aren't actually in a pyramid : you have entered the Sphinx. Defeat the four challenges to find the Green Jewel of Nabooti. (see the related solution below)
the order of the jewels on Nabooti island from top to bottom are ...purplegreenredwhiteblue
There is a key of symbols on the wall when you first enter the pyramid. It shows you the symbols to step on.
You push a stone over and jump up
OMG I haven't gone on in a long time so I have no Idea!
There are no stones.The Nabooti Jewels go in the totem in the following order from top to bottom :PurpleGreenRedWhiteBlue
Once you get the map from the Nabooti totem in the museum, climb near the top of the plane and click FLY.
All of the traders are in Nabooti. Get the gold nugget from the Kaya Forests (in the top of a palm tree).
From the top it is :purplegreenredwhiteblue