Review the item:
Sparkling with jewelry conned from ex-boyfriends,
Gloria keeps an eye out for new victims with fat wallets, she still
needs a pair of diamond earrings to complement a necklace that she coerced
Ricardo to buy.
The comma between ex-boyfriends and Gloria 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. Gloria 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.