He did, however, have some help from British jewelry designer Shaun Leane, The Duke of York noted in the engagement statement.
The ring is estimated to have cost $100,000, Insider's Mikhaila Friel previously reported.
"I am so honored Edoardo chose to work with me to design the engagement ring for Princess Beatrice and to have been involved in this special moment in their lives," Leane wrote on Instagram. "The bespoke experience was a beautiful journey; from imagining the design with Edoardo to the crafting of the finished rings. Being able to incorporate both Edoardo and Princess Beatrice's characters into the design has resulted in a unique ring that represents their love and lives entwining."
Read more: Princess Beatrice's royal engagement ring was designed by her new fiancé Edoardo Mozzi for an estimated $100,000