The British brass threepenny piece is a very characteristic coin and one that brings back the era before decimalisation to many. I’ve made several sets of cufflinks with these coins – usually to reflect a date of birth. Here is an example.
These have a bezel/ wrap over setting, but I do other styles. I have pairs of coins for 1937,1938,1940 to 1945, 1952-55, 1957,1960-1964,1966 & 1967, but most dates between 1937 and 1967 are available (at a price). There’s no reason not to use the coins in brooches or pendants too.