Reliquaire
France, XIVe ou XVe siécle.
Cuivre émaillé et doré, pierreries
Fonds Du Sommerand, Cl. 996

Which can be roughly translated as:

Reliquary
France, 14th or 15th Century.
Enamelled coper and gold, precious stones
Funds from Sommerand, Cluny catalog number 992

More information on reliquaries can be found at Wikipedia and at the Metropolitan Museum of Art site.