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Blue diamonds contain a trace of

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Blue diamonds contain a trace of
A. `N`
B. `Al`
C. `S`
D. `Cr`
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Correct Answer - B
Diamonds are typically colorless, though industrial diamonds (used for making drills or as an abrasive powder) are often black. Most naturally occuring diamonds contain a trace of `N`, but blue diamonds contain a trace of `Al`.
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