To get the gems, in special levels, if you don't die, there will be a death route. Make it to the end, and you will get a gem. Here are the levels:
BLUE: Level 1, Arctic Antics
GREEN: Level 4, Wizards and Lizards
PURPLE: Level 11, The Gauntlet
RED: Level 21, Crash and Burn
YELLOW: Level 22, Gold Rush
CLEAR: make sure you have the yellow jem and go to Compactor Reactor (level 5) and then on the mine cart, before your cart skips the broken part of the track, turn right and you will be in a bonus area (but still on your cart)
Dodge all of the nitro boxes and you will get the
clear gem (this does not work in time trial mode)
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