The "B" stands for Bulgari as this designer was the daughter of the company's founder and after some creative differences with her cousins, she went off on her own.
This was necklace from the Esclave Collection made in 1984. There were only 20 of these pieces made!
There are around 33 carats of diamonds and almost 2 troy ounces of 18 karat gold. It is an amazing piece that needs to be tried on to see just how comfortable they made it.