Butterfly Waist Chain

Is a butterfly waist chain (also known as a belly chain), not a necklace. 

Here is a description of the accessory:

Design: It is a multi-layered body chain featuring several small, dangling butterfly-shaped metal charms. 

Material and Color: The item is typically made of an alloy and finished in a silver tone, though gold-toned versions are also available. 

Style: This type of jewelry has a chic, bohemian flair and is often worn as a fashion accessory with beachwear, bikinis, or crop tops. 

Fit: The chain is adjustable with an extended chain length and a clasp to ensure a comfortable fit around different waist sizes.