Kelly Diamanti graduated from the School of Dentistry of the National and Kapodistrian University of Athens in 2000. She completed her postgraduate studies, Master of Science in Oral Biology with advanced clinical specialization in Endodontics, at the same institution in 2004. In 2012, she was awarded a PhD in Oral Biology, with part of her research conducted at Aix-Marseille University in Marseille, France. At both doctoral and postdoctoral levels, her research focused on the effects of various stimuli on human dental pulp cells, as well as on their potential application in bone regeneration. She has served as a research associate in the Departments of Endodontics and Basic Medical Sciences at the School of Dentistry, National and Kapodistrian University of Athens. She has contributed to scientific publications in both international and Greek journals, as well as to chapters in scientific textbooks. She has also actively participated in numerous scientific conferences in Greece and abroad.

In 2024, she completed a Master of Science in “Global Health - Disaster Medicine” at the Medical School of the National and Kapodistrian University of Athens. In 2023, she participated in a medical mission and worked in a hospital in Tanzania. Since 2019, she has been volunteering at the Polyclinic of the non-governmental organization “Doctors of the World” in Athens. In 2025, she completed the Forensic Medical Sciences training program at the Academy of Forensic Medical Sciences in the United Kingdom.