Beautiful brand new mother of pearl necklace purchased from Sézane (Paris branch). Chain can be adjusted to 3 different lengths. They no longer make this particular design - the closest jewelry I found were the earring set, which were famously worn by Kate Middleton: https://katemiddletonjewelry.wordpress.com/2022/03/25/sezane-celeste-mother-of-pearl-earrings/ Item comes in its original packaging (which includes two little bags). Originally purchased for $180 USD.