A late 19th/early 20th century peridot, diamond and enamel brooch

A late 19th/early 20th century peridot, diamond and enamel brooch
Designed as a central claw-set cushion-shaped peridot with diamond border and square-set diamond cardinal points each with white enamel border with transluscent guilloché enamel scroll surround picked out with white and black dot enamel terminals suspending a pear-shaped peridot drop with enamel cusp, circa 1900, later detachable brooch fitting