Feedback on Pearls
I am new to pearls and would appreciate if anyone can help me identify two strands.  
First strand has 63 pearls and is 16" with what looks like rubies w/2 small pearls on the clasp.  
I am unsure if the rubies are genuine but it is a 14K clasp.  I was told it was from the Art Deco period.
I am not sure if this is correct!  Could this one be a natural strand?
The last picture is a strand which is about 18" with a 14K clasp.  I think this one is cultured and is gritty to my teeth.
Thanks so much,
Anne