Sapphires are a Guy’s Best Friend by Nicola Marsh

I’m a jeweller. He’s the CEO of a fashion house and my high school nemesis. Now we have to work together. What can go wrong?

Sapphire needs to save her jewel business. To do so, she’s desperate enough to team up with Patrick, CEO of a French couture house. She has no intention of mixing business with pleasure. But she doesn’t count on Patrick’s determination to resurrect the old spark between them.
Patrick has never forgotten Sapphire. She may act like he’s a flawed diamond incapable of salvaging, but he sees beneath her act. They’re good together, like the finest emerald choker combined with a strapless satin sheath.
And he’ll do whatever it takes to prove it to her… From Melbourne to Paris, will this mis-matched couple find love?

(Previously published as Her Deal with the Devil by Harlequin Enterprises.)