18k gold plated chain.. makes for a great quality necklace but you know the rules, keep it dry to maintain its shine! 
Please note the color combo options in the product options! It’s listed from left to right.. 
Necklace is approximately 17inches with 2inch extender to be maximum 19inches.
Please read: If you’re sensitive to weight on your neck, this necklace has a little bit more weight than a normal necklace because of the added charms.