Not sure what these are. Even as pendants they seem impractical. One of the most idealised cinematic representations of St Valentines Day was in the Peter Weir 1975 film Picnic At Hanging Rock. Set in Australia in 1901 it is about a party of schoolgirls from a posh academy who go for a day trip to a renowned geological outcrop (some of them never come back). It must rank as one of the best films ever made in Australia.