The necklace! I can't believe there's a thread about this! I've always been obsessed with that necklace. HAHA!
The chain changes over the years, if you watch, but its the same solitaire, probably. Chains don't last forever.
When I was little and watching WTB, I thought it was a single, small pearl. Now, I agree that its a diamond solitaire.
In OLTL (you can see it in the courtroom scene) and Family Ties, its a very thin, short, gold chain.
During Season 1, at least, of WTB, its a thick, flat gold chain.
By the third season of WTB, its a very thin, short, gold chain again.
Maybe a gift from her dad or something?