An amethyst, pearl and enamel pendant necklace, by Phillips Bros. and Son

An amethyst, pearl and enamel pendant necklace, by Phillips Bros. and Son
The pendant designed as a rectangular-cut amethyst within a concave surround decorated with black and white enamel, with pearl and enamel detail at each corner, to a later trace-link longchain with pearl spacers, circa 1875, pendant 3.1cm long, chain 141.0cm long, pearls not tested for natural origin
Maker's mark for Philips Bros. and Son