Layering jewelry is all about balance. When in balance each piece will compliment the other.
The top necklace is more petite. The coin is smaller and the brass bars are more on the
delicate side. The second necklace has a much bigger coin. Heavier chain and it hangs down longer.
They compliment rather than compete with each other.
Go ahead, give it a try!
For more details on jewelry shown here shop Petite Coin necklace and Coin & Pearl Necklace