Reading Comprehension (RC) | Re: Diamonds are almost impossible to detect directly because

HeyGMATNinja andGMATNinjaTwo

can you help to explain the below question? I am not convinced with the answers given in this thread

Each of the following is mentioned in the passage as a difference between G10 garnet and other versions of garnet EXCEPT
(A)level of oxidation
(B)commonness of occurrence
(C)chemical signature
(D)place of formation
(E)appearance in conjunction with diamond
...

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