The correct answer is ‘this earring is far too long for me’ instead of ‘this earring is far enough long for me’. This is so because ‘too’ is used before adjective or adverb. In the above sentence, ‘too’ should be used before the adjective ‘long’. On the other hand, ‘enough’ is used either before nouns (both countable and uncountable) or after adjectives or adverbs.