A collection of early - mid 19th century gem-set 'Halley's Comet' broochesMost set with vari-coloured pastes and vari-cut gemstones including citrine, orange topaz and seed pearls in foiled and closed back settings, some with chased detail, some inscribed to the reverse or decorated with black enamel, including two memorial brooches inlaid with hair, mounted in silver and gold, lengths: 1.8cm - 3.9cm (20)