12019-12-24T08:08:51-05:00Amardeep Singhc185e79df2fca428277052b90841c4aba30044e11661Annotationplain2019-12-24T08:08:51-05:00Amardeep Singhc185e79df2fca428277052b90841c4aba30044e1A stud, about the size of an earring, used to attach a detachable collar to a shirt. It was the norm at the time this novel was written for tailored suits to have detachable collars, so collar studs were required.