Kay Jewelers 16” Silver Necklace with Small Amethyst Pendant with Extension

Continuing my daughter’s room clean out. Will be listing a bunch of necklaces from an old boyfriend that she no longer wants. This is in its original box from the jewelry store. The chain is a 16” silver chain with a 2” extension. I assume this is sterling silver but I don’t see a marking to verify this. There is a small amethyst pendant surrounded by a silver circle. I tried to give an idea of the size in the photos. The chain is in great shape with no tangles. Comes from my smoke free home.