Vintage aurora borealis crystal on sale rhinestone goldtone necklace

on sale Vintage or antique iridescent aurora borealis crystal rhinestone necklace. This vintage necklace or crystal choker is probably from the 40s or 50s and is about 17 inches long to end of chain which has a hook closure. The curved rhinestone necklace is made from vintage iridescent aurora borealis rectangular and round crystals set in goldtone filigree settings along the necklace. Center drop in front of antique necklace is about 1 inch long. Only visible marking looks like a "Coro" label in fine print on the hook Gorgeous vintage necklace is from a personal collection.