Vintage pearls from the art deco period?

[PeterJames]

I honestly know nothing about pearls. I spent the last 3hrs reading up on them here on this site. These came from my great grandmother who lived in Elizabeth NJ pre-1920 up to around 1926/7. They are champagne colored. When I found them they were all Effed up the string was done they fell apart and I grabbed them all. I can't find a Hallmark on the clasp which was a 3 strand necklace with this probably white gold or platinum clasp. Any advice or feedback would be greatly appreciated