The Dead Sea is dead. Nothing grows there except some weird bacteria.
Bacteria as we know, don't make pearls......
Sounds as though someone somewhere down the line misunderstood "Dead Sea" for "Red Sea." That would be my bet.
Indeed. I see many a strand which were grandma's 21st birthday ones. All too often they are imitation - the best possible option from the early years of the last century before Mikomoto got started for many a doting father.
I mentioned these family pearls before in a strand about should we tell or not (that they are not real)