Diaconu was 11 years old when a local scout first approached her to enter the field of modeling; however, she did not take them up on their offer until she was 13.

We thought that was a lot of money, so we went to the school, and I won.Her next booking was headlining a Peter Pan–themed fashion show at the airport Radisson in her hometown of Bucharest.

Through high school, Diaconu modeled part time, but she was teased when she'd return from Paris or London with different colored hair.

[8][9] Other than modeling, she has expressed interest in attending college and stated in an interview with Into the Gloss in September 2014 that she was studying social psychology at Western University of Health Sciences.

[11][12] Diaconu has appeared on the covers of French, American, Spanish, Dutch, German, Brazilian, Korean, Mexican, and Turkish Vogue, French, Russian, and Romanian Elle, and W. Diaconu has walked the runways for Roberto Cavalli, Prada, Tommy Hilfiger, Bottega Veneta, Gucci, Dolce & Gabbana, Michael Kors, Balmain, DKNY, John Galliano, Chanel, Blumarine, Versace, Oscar de la Renta, Emilio Pucci, Ralph Lauren, Salvatore Ferragamo, Marchesa, Giorgio Armani, Thierry Mugler, Moschino, Stella McCartney, DSquared2, Tom Ford, Vera Wang, Carolina Herrera, rag+bone, Chloé, Missoni, Gianfranco Ferré, Emporio Armani, Prabal Gurung, Céline, and Lanvin.

She has appeared in advertising campaigns for Viktor & Rolf, Gucci, Hugo Boss, Donna Karan, Céline, Tiffany & Co., De Beers, Chloé, Ralph Lauren, Dolce & Gabbana, Tod's, Salvatore Ferragamo, David Yurman, Giuseppe Zanotti, Trussardi, Isabel Marant, Balmain, Max Mara, Adolfo Dominguez, Custo Barcelona, J.

Although she states that while she is not an activist, she believes in fighting against racism and homophobia in her own country as well as building "sustainable environment and economical growth in places such as Nairobi, where rape among 6-15 year olds is not uncommon".

"[14]She is involved with the St. Jude Children's Research Hospital, and Art and Abolition, an organization dedicated to ending child sex slavery in East Africa.