Cf. M. Della Valle, Michele Della Valle Jewels and Myths, Woodbridge, Antique Collectors' Club, 2014, p. 305 for a similar pair of earrings

MICHELE DELLA VALLE
Michele della Valle began designing costume jewellery at the age of 16. In 1978 he opened his own workshop in Rome. This was the beginning of a collaboration with Bulgari on special orders, and his recognition as a new designer by a clientele of celebrities throughout Italy. In 1987, he moved to Geneva to develop his own jewellery brand, still thriving to this day.