What kind of Accessory is shown in the picture?

Something I haven't seen for a long time. Wish that classy style of dress would come back.

Some gentlemen insist one is not properly dressed unless wearing a shirt that requires cufflinks along with "hand tied" bow or Windsor knot. Of course, black or cream color dinner jacket goes without saying.

my dad had many pairs of them during the 60's & 70's. I wear them occasionally when going out....

I use them very often.