At 02:05 PM 2/23/2009, R. Michael Medley wrote:
"In the western world diamonds were at first not regarded as objects of
beauty; other stones such as emeralds and red garnets were preferred."
Is "such as" here a preposition heading an adjectival prepositional phrase
or some kind of conjunction, perhaps a conjunctive adverb akin to "for
example"?

I suppose one could think of it as preposition, like for, with the phrase adjectivally modifying stones. To me, though, such as just serves as the introducer of an appositive, in which case I guess one might call it an expletive.
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