Here is how to get most of the colour gems:
Level 1: Turtle Woods Blue Gem; Just simply walk through the level Without getting any boxes and VOILA! The blue gem should be at the place where the box count is.
Level 2: Snow Go: Red Gem: First go in to Air Crash and on the first river DON'T get on the surfboard thing, there should be some boxes in front of you in the river, use them to jump on to the empty platform. The Platform should warp you to a secret warp area which opens the Snow Go Red Gem warp gate and just that level thing.
Eel Deal: Green Gem: There is a wall which is guarded by nitros just get yourself to the wall and you should be able to jump through it finish that bit and the green gem should be at the end of it.
Level 20: Bee-Having: Purple Gem: Just go through the level as usual until you reac a staircase of nitros, They wont explode! Jump up on them to the top one which should warp you to a Bonus level type a thing just finish that and VOILA!
The purple gem is yours.
Not so sure on the yellow gem but I heard that you have to get all the boxes except on the board part(It Doesn't Work!!). If anyone Knows could you PLEASE put it up for me
Added by: cenafu12 Jul 2nd 2006, ID#13797