Who made or sold this necklace?

I bought this necklace at a silent auction and there are no trademarks or other identifying marks on it. It reminds me of Brighton, but since it doesn't have the B anywhere I doubt it is. Does anyone know who made or sold this necklace? The stone looks amethyst like, but maybe pinker. Although it's primarily silver, there is a band around the stone that looks yellow gold. Thank you for any help!!!