Deniz Gamze Erguven, the 37-year-old Turkish-French director, has made the kind of feature film debut that moviemakers only dream about.

“Mustang,” the story of five orphaned sisters in Turkey, was a sensation at the Cannes Film Festival last year and was among the nominees for the best foreign-language film at the Oscars last month. Fame has merged two worlds for the director: the practical day-to-day life of a budding filmmaker — along with the birth of a son early last year; and the sudden success that took her to the Academy Awards.

Her choice for the perfect watch: the Chanel Boy.Friend, which debuted in 2015 and retails from $12,500 to $27,000, depending on the style. (New versions are being introduced at Baselworld, the watch and jewelry trade show, this week, too.)

“My personal style can go from extremely casual to very sophisticated — it all depends. The Boy.Friend watch has a way of dressing up any kind of style,” she said by email. “Even with a simple T-shirt and jeans, just by wearing the watch, it adds a little touch of sophistication.”

Ms. Erguven, born in Ankara, the Turkish capital, and raised mostly in France, graduated from La Fémis, the prestigious Paris film school, in 2008. She made several short films before “Mustang,” which she co-wrote with the French filmmaker Alice Winocour.

“To me, wearing a watch is a change from a decade of just looking at my phone all the time,” Ms. Erguven said. “It is probably the most discreet ‘jewel’ — at the same time, a little object with its own personality. I also appreciate the fact that the design of the Boy.Friend is purposely androgynous. I feel like I borrowed my husband’s watch, just as I would borrow his shirts.”