Antique 18 ct Georgian brooch

Antique 18 ct Georgian brooch

Antique Georgian 18ct gold (tested, not marked) tiny brooch or lacepin set with a red stone and inscribed on the reverse with ''Frederick Green obt 26 July 1826 at 2 yrs''.
Approximately 22mm across and 3.1 grams on our scales.
Please see all the pictures. I aquired this piece in England some years ago.