American pop star Nicole Scherzinger is reportedly hunting for a dazzling engagement ring for her forthcoming engagement ceremony with beau Lewis Hamilton.

Nicole is currently hunting for an exquisite diamond ring, and has been visiting multifarious jewellery stores to buy one for the occasion.

"She's looking for diamonds and she wants something unique," the Herald Sun quoted a source as saying. "She found a Cartier ring that she liked, but she was worried that other people had similar designs," the source added. Nicole has been dating Brit formula one racer Hamilton for a year.