Take another look at the sentence:

Sparkling with jewelry conned from ex-boyfriends, Sylvia keeps an eye out for new victims with fat wallets, she still needs a pair of diamond earrings to complement a necklace that she managed to coerce Ricardo into buying.

The comma between ex-boyfriends and Sylvia is correct. Sparkling with jewelry conned from ex-boyfriends is a present participle phrase. A present participle phrase will begin with an ing word like sparkling. Sylvia keeps an eye out for new victims with fat wallets is a main clause. When a present participle phrase introduces a main clause, you need a comma to separate them.

Go back to the sentence to try again.

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