H&M Shell collar necklace

This is a heavy necklace, 298 grams according to the website. Large statement jewelry is not always heavy, but when it is made of solid real layered shell it is! This piece was an online buy and arrived with some pieces chipped (check the photo of the back closely) the chips don’t affect the wearability, and after looking on the website I think that is just the aesthetic/quality of shell they used. I am pricing down from original price even though it has never been worn because I feel it’s not in perfect condition. Adjustable back 16-18”