Pearl is used to describe something that looks like a pearl.
tiny pearl buttons.
珍珠般的小扣子。
pearls
A pearl is a hard round object that is shiny and creamy white in colour. Pearls grow inside the shell of an oyster and are used for making expensive jewellery.
She wore a string of pearls at her throat.
她那时脖子上带着一串珍珠。