estate jewelry/necklaces #1

This little diamond pendant hangs from a most delicate 'braided style' chain approx 15" long, the stone itself measures about 4mm alone and 5mm across the diagonals of its mounting prongs. Pic 2 shows sorta how it hangs from the chain, pic 4 shows the backside of the mount, pic 3 includes its clasp which my jeweler said was marked 14K even when I questioned that, because to me it all looks quite a bit more "silver" in color...maybe it's just "white gold", what would I know...?? ;-) :-) The whole thing weighs 1.3g by my little digital scale, and its stone is most likely genuine, again according to my jeweler.

I have little to no idea of how truly old it might be or its exact story, just a minimal idea of two or three various ladies that it might have once belonged to.