Anybody know the manufacturer? No brand stamp on vintage clasp of pearls

Hey I purchased this necklace from an estate sale and I cannot find another clasp like it. It has a heart filigree clasp with 2 diamonds on white gold.
I believe the beads are black pearl. I see variation in the sizes.
Has anybody see this clasp before? There are no other signed stamps besides 14kg

thank you!

 

the clasp, nice as it is , won't tell u who made or sold the pearls ...
they look hand knotted , so that's a nice sign....but they may be dyed ???

 

Almost have to be. Natural black pearls that well-matched would have a fancy, EXPENSIVE, clasp on them. These are Chinese freshwaters, most likely. It's a perfectly nice necklace, but that clasp was made in a factory in China somewhere and sold to whoever wanted to use them. There's no way to trace it, sorry.