Diminutive French 18ct acrostic buckle spelling Souvenir in tiny foiled gemstones c.1830.
Charles X period. Paris mark with a Rams head facing left(1819-1838).Also makers mark SP.
From bottom left the stones are S(sapphire)O(opal)U(uranite)V(vermeil,alternative term for garnet)E(emerald)N(nephrite jade)I(iolite)R(ruby).
3.5 by 2.2cms.
Historic repair to reverse.