Estate find...measures about 17" opened, does not include the clasp. This is stunning! Once this is on your neck, you will fall in LOVE! I did!!! I have had it for a while, I never go anywhere fancy, so I decided to find it a new home, someone who gets out and gets noticed. I don't know if the stones are CZ or rhinestone, all I can say is they sparkle like diamonds! The clasp is the GG and it is stamped Givenchy on the inside. This was found with others circa early 1980's. There is minor wear between some of the links, you can't tell without a jewelers loop. All stones are presents and in good condition.