Bfod

Me thinks it is a medievel or slightly post medievel " Posy Gold Ring " , if you search google you will find similar. Your do not have engraving so may be worn out or to old. Here is a link to one and Mr Potter of all names is the finder. https://www.dailymail.co.uk/news/article-9760071/Treasure-hunter-digs-17th-century-gold-posy-ring-engraved-two-hearts.html

It has a few signatures of it being VERY OLD. You should probably contact your local experts in the field, it may be worth multiple times its weight in gold. Very nice find.