A collection of seven hardstone brooches, early-mid 19th century

A collection of seven hardstone brooches, early-mid 19th century, the seven brooches including one set with a panel of malachite within a gold cannetille border, circa 1830, 5.3 x 2.6cm; one set with a large oval agate within a gold mount in the Archaeological Revival style, circa 1870, 5.9 x 4.7cm, later pin; a brooch set with a white chalcedony applied with a cut paper image of Athena in chariot pulled by owls in a gold mount with a glazed cover, 2.9 x 3.4cm, and four additional brooches set with sections of agate, some pins later added