On her 18th birthday, Diana was given a triple-strand pearl choker by the Spencer family.[12] Both of Diana's older sisters had also received matching chokers on their 18th birthdays.[2] It consisted of three rows of pearls with a turquoise and pearl cluster clasp; the clasp was only visible when it matched the colour of her outfit, otherwise hidden at the back. The Princess later altered the clasp to be all pearls.[3]