J Crew Dazzling Necklace

This is a statement necklace by J crew. A statement necklace is one way to dazzle up an outfit. I've worn it a few times but don't know the material. Photos have been taken without trying to clean the necklace, see photos for natural wear on chain. All jewels intact, shiny, non missing It measures 20' long and is adjustable to shorter lengths. Lobster claps easy to use. Comes with original dustbag