Yellow gem

The yellow gem is a rare type of gem belonging to the colored gems in the Crash Bandicoot series. Like the other colored gems, the yellow gem is usually collected by completing a special task. Once it is recovered, the yellow gem will unlock special routes by usually activating a platform or platforms in certain levels, known as gem paths.

Crash Bandicoot
In the original game, the yellow gem appears similar in shape to the green gem, with a flat and oblong shape, however, its ends are more flat than the pointed-end green gem, and thus it appears more rectangular.

The yellow gem is obtained by breaking all the crates and not losing a life after the first checkpoint in The Lab. It opens up the yellow gem paths in Lights Out and The Great Gate. However, the yellow gem isn't exactly necessary to get to the yellow gem path in The Great Gate, as there are two methods of bypassing the exit portal without the gem's use.

Walkthrough
 DM's Guide Crash Bandicoot 1 - The Lab (Yellow Gem)-0 

Crash Bandicoot 2: Cortex Strikes Back
The yellow gem appears drastically different in this game, similar in cut and shape to a clear gem, but taller. It is also much darker in color. Much like all the colored gems, it has become opaque instead of translucent.

It can be obtained in Plant Food by reaching the end of the level before the timer, which appears just before the first checkpoint and gives a time of ~1:03-1:13, reaches zero. Doing so requires at least one Aku Aku mask as there is a point near the end of the stage where Crash cannot avoid taking damage from a nearby Venus Fly Trap. It opens up the yellow gem path in Sewer or Later and part of the multicolor gem path in Spaced Out. The yellow gem platform is also the widest.

Walkthrough
 Crash Bandicoot 2 How to Get Yellow Gem 

Crash Bandicoot 3: Warped
The yellow gem appears exactly the same as in Cortex Strikes Back.

It can be obtained by completing the secret route in Hang'em High, which opens as level 27 when the player collects ten relics, although this is not obligatory, as the player can get from the main path to the secret route by two different methods. It opens up the yellow gem path in Dino Might!, which in turn contains the secret warp for Eggipus Rex, and in addition part of the multicolor gem path in Bug Lite. Again, its corresponding gem platform is much wider than the others.

Walkthrough
 Crash Bandicoot 3 Warped - 105% - PART 9 

Crash Team Racing
The yellow gem appears similar in color, perhaps slightly lighter, than in Cortex Strikes Back and Warped. However, much like all five colored gems in the game, it has assumed the shape of a typical clear gem from Cortex Strikes Back or Warped.

It is obtained by completing the Yellow Gem Cup tournament. If the player completes the CTR Challenges on the race tracks Dingo Canyon, Tiny Arena, Hot Air Skyway and Oxide Station to collect all yellow CTR tokens, then the Yellow Gem Cup will be available to play, where the four races can be raced again in a tournament. If the player wins the most points from all four races, they win the yellow gem. It is required to complete the game because the other four gems are needed to unlock Turbo Track. The yellow gem also unlocks Pinstripe Potoroo as a playable character.

Walkthrough
 Crash Team Racing Yellow Gem Cup 1080 HD 

Crash Bandicoot: The Wrath Of Cortex
The yellow gem has a slightly different model than in Cortex Strikes Back and Warped, it becomes more clear, smaller, a less intricate pentagonal cut and is slightly less distinguishable in shape to a clear gem, but nevertheless remains taller. It is also a much brighter yellow color.

It can be obtained by completing the death route in Gold Rush. It opens up the yellow gem path in Compactor Reactor.

Walkthrough
 Crash Bandicoot The Wrath of Cortex - Level 22 Gold Rush (Crystal Gem Yellow Gem) 

Crash Bandicoot: The Huge Adventure
Like all the game's colored gems, the yellow gem is identical in shape to the clear gems, but bright yellow in color.

It is located in Final Countdown. It unlocks the yellow gem path in Ace of Space, which is the only section of the game that uses the space motorcycle.

Crash Twinsanity
Like the other gems, a yellow gem can be found hidden throughout each level in the game, meaning there are sixteen in total. Collecting a yellow gem unlocks an "unseen" gallery in the game's concept art, accessible through the pause menu.

Walkthrough
 Crash Twinsanity - Gem Locations 

Crash Bandicoot N. Sane Trilogy
The yellow gem reappears in the N. Sane Trilogy remasters of the first three games where it reprises the same role it had in the original versions of those games. It has a custom-drawn icon on the pause screen and looks the same throughout all three games.

Walkthroughs
 Crash Bandicoot N. Sane Trilogy - The Lab - Yellow Gem Guide Crash Bandicoot 2 - "Plant Food" Yellow Gem (PS4 N Sane Trilogy)-0 Crash Bandicoot N. Sane Trilogy Yellow Gem (Warped)-1 

Crash Team Racing Nitro-Fueled
The yellow gem reappears in Crash Team Racing Nitro-Fueled where it reprises the same role that it had in the original version of Crash Team Racing. However, it no longer unlocks Pinstripe Potoroo as a playable character.

Appearances

 * Crash Bandicoot
 * Crash Bandicoot 2: Cortex Strikes Back
 * Crash Bandicoot 3: Warped
 * Crash Team Racing
 * Crash Bandicoot: The Wrath of Cortex
 * Crash Bandicoot: The Huge Adventure
 * Crash Bandicoot Purple: Ripto's Rampage (as a card)
 * Crash Twinsanity
 * Crash Bandicoot N. Sane Trilogy
 * Crash Team Racing Nitro-Fueled

Trivia

 * The yellow gem often appears later in the games, or generally more difficult to obtain. In the original game and The Huge Adventure, it is located in the final regular level of the game. In Wrath of Cortex, it is the final colored gem in level numerical order. In Cortex Strikes Back, it is fourth colored gem of five in level numerical order, and arguably the hardest to obtain with considerable skill required. In Warped, it is the earliest colored gem in level numerical order and can be the first to acquire, but in practice the latest in level order as to how it's collected and possibly the last the player will obtain if the player saves time trials for after defeating Cortex the first time and obtaining the Crash Dash. Finally, in Crash Team Racing, the Yellow Gem Cup is composed of the 8th, 12th, 15th and 16th of the game's 16 main race tracks, some of the longest and most challenging tracks.
 * It is the only one of the five gems to be featured in CTR which did not reappear in Crash Nitro Kart.

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