Vintage necklace large amethyst glass stone Chain gold plated marked CH 24K

For sale is this Vintage necklace with a gold plated chain marked 'CH - 24K'. The pendant drop has a large amethyst coloured glass stone surrounded by simulated pearls.

Chain is approx. 47 cm (18 1/2") long.
Total pendant drop approx. 10.1 cm (4").