Albus Dumbledore explained in that Voldemort had a different plan in mind for his diary Horcrux than the others, and Lucius Malfoy was supposed to be a part of it.

Source: https://screenrant.com/harry-potter-movies-lucius-malfoy-diary-plan-cut-ruin/

Hepzibah showed Riddle the locket and cup while he was working at Borgin and Burkes, and he stole both from her, using the murder of a Muggle vagrant to create the locket Horcrux.

Source: https://screenrant.com/harry-potter-7-horcruxes-explained-destroyed/