A late 19th century reverse carved rock crystal brooch and similar stickpin

A late 19th century reverse carved rock crystal brooch and similar stickpin, comprising: a brooch decorated with a portrait of a racehorse with jockey up above the inscription 'Milligramme' against a mother of pearl ground, within an openwork foliate scroll yellow gold frame, width 3.5cm; and a stickpin with the terminal depicting a greyhound against a mother of pearl ground, in a yellow gold frame, stamped 18, length 7.4cm