Re: The Da Vinci Code http://home.arcor.de/berzelmayr/champaigne.jpg
db-
this is a full pic of the last supper.
look at Jesus' neck...he has the same type of trim the other figure does, there is also a disciple standing to the right with a similarly-designed neck-trim (but it blends more with his tunic...he is also, incidently, wearing similar colors). if that was what you are talking about, don't think it's a necklace...there is what i see as a crack in the plaster that goes across the figure's chest where one would expect a necklace to be, but it's line carries through into the figure's clothes at an angle that a chain would not take.
i see no breast so will just have to disagree there.