Frankly, I'd rather forget all lobster claws. They tend not to live very long, so for my own use I always replaced them with spring clasps. But they are a perfect way of dating late 20th century necklaces.
The ones I'm thinking of are on a couple of gold bracelets. Those aren't too bad. Totally agree on spring clasps.
Welcome to the forums. Attractive costume pieces, especially those with the blue borders - are they brooches? It would be nice if you would show the backs of the items, findings can be indicators of age, and perhaps give sizes as well, for instance the length of the "too short" chains (a 15" choker wouldn't be unusual) - feel sure you'd mention any marks. When making enquiries, please share any information that might be helpful, along with images that show details. The sprigged script initials are 'CTC', if read as a personal cipher/monogram, the larger 'T' would be the surname, if for an organization (or just random letters), the order could differ, and not unusual for one of the letters to be reversed, done for a symmetrical effect. Family histories are often a bit off, but personally, they look mid 20th century to me, perhaps 1950s-60s - the bar-link chains look to be original, the foldover-clasp in the Etsy linked piece not uncommon for that time (does the other chain like that have the same clasp?) The chain with the lobster-claw clasp isn't original, it's a different color and on a piece with a rectangular bail like the earrings that seem to be hanging from weird foldover-clasp screw-backs, or the piece that looks to be attached with foldover-clasp to the heavy curb chain at top right in your 2nd pic (is that a bracelet?) - also unlikely the cord is original, and would think the same for the gold rope chain. Curious about the small piece that looks to be acrylic/Lucite - is it a pin? Is the metal bit enameled like the others? As an old collector, it looks a lot like some mid-20th century buttons... ~Cheryl
My Grandmother was born in 1896. She died in 1986. She was still getting jewelry given to her for Christmas at least to 1984. She did not want clothes or food so the family gave her jewelry which made her happy.