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The Japanese Gen I cartridges are grey like most Game Boy cartridges.
Japanese Gold is a really dark navy blue while Japanese silver is a dark grey for whatever reason. Game Boy games that had enhancements on the GBC had black cartridges.
Japanese Crystal and Japanese Gen III all match their international cartridge colors.
Diamond, Pearl, and Platinum are the standard dark grey DS cartridge.
HeartGold, SoulSilver, Black, White, Black 2, and White 2 are enhanced infrared DS cartridges and are totally black.
Gen VII uses standard 3DS and Switch cartridges.
