Necklace

I dug this up at a digging spot of ours, and that dump site was dated back in the mid 1800 era. The necklace is all there in one piece it is still wearable, which I have done once and it fit almost like a choker necklace, but it fit around my necklace losely and the stones hang very nicely on the chest.

Anyway I dug this up about 9 years or so , The necklace itself has no rust or tarnish, so it has to be silver I guess. But it was kinda dirty when I dug it up 8 feet down in the ground right in the middle of this dump site. My husband and I are clue less about it. I'll send a close up of necklace part (the metal), and a close up of the stones and the silver setting and onee of the hole thing. I hope you can help us