
Claire has worked for Denny Montana for four years, nurturing a secret, unrequited love as he barely acknowledges her. When Denny’s brother Regan returns to manage the sale of the family vineyard, Claire and Regan conspire to make Denny jealous and pull him away from his damaging relationship. Their plan quickly spirals as both struggle to control the emotions they’ve unleashed.
Does Diamond Girl have end credit scenes?
No!
Diamond Girl does not have end credit scenes. You can leave when the credits roll.
Explore the complete cast of Diamond Girl, including both lead and supporting actors. Learn who plays each character, discover their past roles and achievements, and find out what makes this ensemble cast stand out in the world of film and television.

Dyan Cannon
Abby Montana

Joely Collins
Claire Barnard

Royston Stoffels
Jean-Marc Bernier

Terence Bridgett
Hairstylist

Kevin Otto
Denny Montana

Jonathan Cake
Regan Montana

Diane Wilson
Sales Clerk

Nicholas Dallas
Waiter

Paddy Canavan
Mrs. Rose

Zaa Nkweta
Courier

Blair Slater
Sean Barnard

Jacqui Singer
Spa Hostess

Stacey Sacks
Lori

Denise Virieux
Margo De La Vera

Blaise Koch
Maitre'D

Roger Lucey
Taxi Driver
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Challenge your knowledge of Diamond Girl with this fun and interactive movie quiz. Test yourself on key plot points, iconic characters, hidden details, and memorable moments to see how well you really know the film.
Who is the unassuming paralegal working for Denny Montana?
Claire Barnard
Regan Montana
Margo De La Vera
Jean‑Marc Bernier
Show hint
Read the complete plot summary of Diamond Girl, including all major events, twists, and the full ending explained in detail. Explore key characters, themes, hidden meanings, and everything you need to understand the story from beginning to end.
Claire Barnard, an unassuming paralegal, works in a small law office for Denny Montana, a carefree lawyer more interested in tennis and chasing women than he is in his work. Claire’s quiet efficiency keeps the firm running smoothly, and after her parents died in a car accident four years ago, she has looked after her younger brother, Sean Barnard. In the four years she’s worked for Denny, she has kept her romantic feelings for him to herself, keeping a calm professionalism that quietly underpins the practice.
Regan Montana, Denny’s haughty older brother, arrives from London and quickly takes over Claire’s office and the planned merger negotiations. He is wary of the motives of the prospective buyer, Jean-Marc Bernier, and believes he can secure a much larger payday for the family winery. To impress Bernier, Regan takes Claire to a makeover spa and outfits her with expensive, stylish clothes, transforming the once unassuming paralegal into a glamorous woman who can stand in sharp relief beside the wine’s storied legacy. Denny and Margo De La Vera are both impressed and surprised by her new appearance, a change that shifts the power dynamics in the negotiations.
Regan explains to Claire that Margo has Denny unwilling to hold out for more money, and he proposes a plan that leverages Denny’s competitive streak by pretending to be in love with Claire. The aim is to draw Regan’s eye away from Margo and toward Claire, turning a business deal into a delicate personal game. As they work this ruse, Claire and Regan begin to learn more about each other, and Claire starts to feel genuine affection for him. Meanwhile, Bernier’s interest seems tied to the possibility that his wine label might soon be diluted by cheaper vintages from other holdings, a concern Regan shares as they discuss the Napa Hills property—the heart of the family’s legacy.
Claire’s feelings grow deeper as the charade continues, but the situation becomes messier when Denny grows increasingly jealous. When Regan leaves town for a few days, Denny asks Claire to dinner, hoping to recapture their old dynamic. Regan arrives unannounced at the dinner, breaking up the date—indicating his own jealousy and the fragility of the plan. Bernier eventually agrees to Regan’s demand for an additional two million dollars, a concession that momentarily reshapes the deal and stirs fresh doubts about the true motives of everyone involved.
At Napa Hills, Regan confesses his unhappiness with selling the property that had been purchased by his grandfather, and his mother, Abby Montana, hopes he will stay and take over the vineyard himself. Abby’s concerns add emotional weight to the negotiations, even as Regan shows Claire the property and the two share an intimate kiss that deepens the romantic tension. Later, Claire overhears Regan telling his mother that he plans to leave for London, a revelation that breaks her heart and reframes the entire conflict.
Denny arrives to support Claire as she processes the revelation, admitting that the pressure of competing with Regan had driven him to pursue her in the first place. He suggests they maintain their ruse—pretending to be in love—to keep Regan entangled and to push him toward a decision. Yet as the story moves toward its close, the negotiations deteriorate, and Regan’s ongoing struggle to commit to a life in Napa Hills becomes clear. That night, after seeing his brother kiss Claire, Regan returns to her room and they share a passionate, definitive moment that tests both their loyalties and their futures.
The next morning brings no easy resolution. Regan contemplates leaving for London, unable to commit to the life Claire invites him to share, but Denny intervenes again, urging him to choose love over fear and urging him to return to the woman who has captured his heart. The vineyard becomes the hopeful stage for a new beginning as Regan finally confesses his love for Claire, and the pair begin a life together at Napa Hills, balancing the weight of legacy with the promise of a shared future.
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