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4. It is very difficult, unlike that of other diamonds, to determine whether the color of Green diamonds is natural or treated.
5. Green diamonds are unlike other diamonds in that it is very difficult to determine whether their color is natural or treated.
There is some semblance of a proper comparison only in choices 4 and 5. However, 4 is wrong because of using the phrase 'that of other diamonds' implying that all the other diamonds have one color. It should have been 'unlike those of'. This
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