Hepzibah Smith

Hepzibah Smith is introduced within Albus Dumbledore's Pensieve, as part of a series of memories shown to Harry Potter by his headmaster. She is described as having been an extremely wealthy, well-born old witch who enjoyed collecting antiques and collectibles. In the memory, Hepzibah wears long robes and gowns of pink, and when sitting upon her throne-like chair, she is described as giving the impression of a large "melting iced cake". She wears a large, elaborate, ginger wig upon her head (most likely the colour of her hair before it greyed) and dabs her red cheeks with rouge. She is described as being immensely fat.
Tom Riddle, fresh out of Hogwarts and working for Borgin and Burkes, visits Hepzibah to make an offer for some goblin-made armour which she owns. He presents her with flowers, and charms and flatters her. Enamoured with Riddle, Hepzibah shows him her most prized possessions – a cup, owned by her ancestor Helga Hufflepuff, and a locket which once belonged to Salazar Slytherin, that she had purchased from Borgin and Burkes. Caractacus Burke had purchased the locket for a tiny sum from Riddle's mother.
Only a few days after the events of the memory occurred, Hepzibah died, and Hufflepuff's cup and Slytherin's locket were never found. Dumbledore theorizes that Riddle had killed Hepzibah and tampered with the memory of her house-elf, Hokey, so that she thought she had accidentally poisoned her mistress. Hufflepuff's cup and Slytherin's locket would go on, as presumed by Dumbledore, to become two of Lord Voldemort's Horcruxes.