A man and his wife move into a beautiful old house. He adores his wife and they are a very happy couple. Soon after moving in, the wife finds or somehow becomes enchanted with an antique necklace that somehow comes into her possession.
I remember the necklace as having a large green stone. If I remember correctly, the wife then becomes obsessed with the former owner of the necklace, a beautiful woman from Victorian times. The former owner of the necklace uses the wife's obsession to drain energy from her to make herself stronger or to come back to this world somehow(?)
Despite her husband's best efforts to save her, the wife dies and I believe the movie ends with the husband holding his wife's body in his arms and sobbing.
I want to say that the wife was played by Sharon Stone but nothing in her filmography I've seen seems to fit.
I saw this on TV in probably the mid 1980's in the US.