Hi. I have three sets of pearls that have been given to me. The first set on the bottom was my grandmother's - she was born in 1899 so probably from the early to mid 1900s. I assume they are costume. There are no markings on the clasp. There is some wear at the connections, but overall they are in ok shape. This is a 14" choker with 53 pearls. The other two necklaces were given to me by my mother-in-law. Supposedly they were her mother-in-laws: an Italian woman who came to the United States in 1900. The middle necklace is in horrible condition. It is 24" long with 95 pearls. They are dull, dirty and flaking a lot. The top necklace is a pretty champagne golden color. 15" strand of 94 graduated pearls, there is no clasp. They appear to be in good condition. I plan to restring this necklace for sentimental reasons and because I like the color! Can anyone tell if these are real pearls and suggest an appropriate clasp. I can send more picture, just let me know what you want to see. Thanks so much for any thoughts or comments!