The TV series "Diamond Crown" is a Ukrainian detective melodrama. The main character of the story is Maria, a graduate of an art university. After graduating, she finds herself without a place to live and agrees to a lucrative offer from her friend Zhanna. Zhanna takes custom orders for expensive jewelry and asks Maria to design them. However, Zhanna's husband runs away, taking all the money with him, leaving the girls in debt up to their ears. Maria doesn't want to abandon her friend in trouble and gets a job working for a mysterious businessman.