As well as the Clear Gems that will be collected along your journey to defeat Dr. Cortex for the second time, you will also need to recover the gemstones known as the Coloured Gems with their magical properties. They are five of them in total in Crash Bandicoot 2 and can be collected by completing certain objectives in the level where the gem resides.
Unlike the first game, it is not necessary to complete these tasks without losing a life. Below is the list of each coloured gem and their location within the second Crash title as part of the Crash Bandicoot N’Sane Trilogy.
Location: Level 1: Turtle Woods
Condition: Complete the level without breaking a single box.
Location: Level 10: The Eel Deal
Condition: At the end of the level, you will come to a fork in the road. Take the right path, evade the Nitro boxes and jump through the hidden door at the end of the passage to find the gem.
Location: Level 11: Plant Food
Condition: Complete the level within the time limit that appears on screen after the first checkpoint.
Location: Level 2: Snow Go
Condition: First of all, you will need to reach the Secret Exit platform hidden in Level 7: Air Crash. After the first checkpoint, bounce across several boxes in the water to reach the Secret Exit.
Next, you will need to use the Snow Go warp portal that is unlocked in the Secret Warp Room. Complete this newly accessed area to reach the gem.
Location: Level 20: Bee-Havin
Condition: Climb the fake Nitro box staircase to be warped to a bonus round. Complete this area to get the gem.