
A ferronière is a style of headband that encircles the wearer`s forehead, usually with a small jewel suspended in the centre. It was worn in the late fifteenth century and was revived in the second quarter of the nineteenth century for both day and evening wear. It is often said to be named after a portrait attributed to the school of Leonardo d....
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http://en.wikipedia.org/wiki/Ferronière

Ferronière: A jewel held to the forehead by a chain worn by women in France and Italy in the 16th century to hide the marks of syphilis. The ferronière returned in the 19th century when syphilis was epidemic in Europe. Named for Madame Ferron, mistress of the French king François I.
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http://www.medterms.com/script/main/art.asp?articlekey=25467

A piece of jewellery in the form of a narrow band with a single central gemstone that is usually worn on the forehead
Found on
http://www.saffronart.com/sitepages/jewelry/glossary.aspx
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