The function f(x) identifies the color of certain words, predominantly gemstones and a few countries. For gemstones, it outputs the color commonly associated with the gem (e.g., ruby -> "Red.", sapphire -> "Blue.", emerald -> "Green.", amethyst -> "Purple.", diamond -> "White"). For some countries, it outputs a color (e.g., Spain -> "Red," Brazil -> "Ruby."). The output has a period at the end for gemstones, but not for countries.

