Two gem set necklaces

One of Navaratna design, set with pearls, and suspending a series of collet-set gems, including rock crystal, ruby, coral, turquoise, emerald, sapphire, quartz and garnet, length approximately 410mm, mid 20th century; and a pendant collet-set with a heart-shaped amethyst within a split pearl frame, to a trace link chain, length approximately 420mm; late 19th century.