She is one of the most popular models from Romania. She has been featured on the covers of magazines from France, Romania, Russia, Spain, and Switzerland. Diaconu posed for a Vogue magazine for the first time at age 21, for the February 2013 issue. She is the face of Gucci, Dolce & Gabbana, and Belstaff. In 2014, she was shot in a spring campaign for Belstaff, featuring David Beckham.