Jewelry today is almost always decorative. But jewelry in the past was also functional. The ancient and medieval ring brooch, called a penannular brooch was the forerunner of the modern brooch and the humble safety pin. Ring brooches were essential in a time before zippers, buttons and velcro were invented! They were used to fasten cloaks and the tops of gowns. Wealthy people could afford to have elaborate ring brooches made from precious metals such as gold or even bejewelled.

In Hugh Tait's book (details below), there is a picture of a gold ring brooch dating from 13th century England which has this inscription on both sides : IEO:SUI:FERMAIL:PUR:GAP:DER:SEIN:+ KE: NU:SVILEIN:NIMETTE:MEI . It translates as "I am a brooch to guard the breast that no rascal may put his hand thereof"!

Photo credit : Crowolf on Flickr
who took this picture of a Celtic Penannular ("nearly round") cloak pin brooch at the Walters Art Museum, Baltimore, MD, USA.

References

Hugh Tait (1986). Jewelry : 7000 years. British Museum