HELP IDENTIFY SIGNATURES ON VINTAGE EARRINGS

These are some of the jewelry left to me by my mom. I can't make out the name on these (I'm not a earring guy!) & hope someone here can decipher them?
Also, on one pair there is green mold? or discoloration - what is the best way to clean them?
Thank you for all the help so far!

 

Hi,
I would attempt to clean the green with vinegar and a soft brush BUT wait for the Joolies to come with their selections.
greg

 

Thanks greggsglasss - I'll wait to be sure!

 

Try Stephen Dweck for the carved stone earrings.

Debora

 

Agreed - Stephen Dweck on the top two pairs.

 

@gregsglass is correct about vinegar to remove the verdigris, in the meantime, they should be isolated from the others, as it will spread as if it's contagious.

 

Cheap vinegar, old toothbrush, wipe off.

 

Going to buy some vinegar today & get to work on them, thank you all!
I also found this seashell necklace, these earrings & this Mexican bracelet in Stephen Dweck velvet bags (unlike the first 2 pairs of earrings I asked about which were in ziplock baggies) - are these Dweck? Didn't he sign his work?
Thank you

 

The Mexican bracelet is lovely, journey. Nice colonial style motif.
The mark is pre-1979. FHV is one of the Taxco makers, but I don't know who FHV is exactly.

 

Thank you Anyjewelry ; great help (and I can put other earrings in that bag!)