Vintage Exotic Handmade Chocker Necklace With Natural Gemstones

One of a kind vintage silver choker necklace. 15" long. With natural gemstones - purple amethyst, yellow citrine, green peridot and clear quartz. There is a 925 stamp on the clasp, but it looks like, possibly, silver plated brass. Silver beads in between the stones are either 925 sterling silver, or silver plated brass.