Chain is approx. 18″ long. Charm is 3/4 of an inch in diameter and Swarovski charm is optional in either Pacific Opal or Clear and is a bi-cone 6mm. The Gold chain is 18k Gold plate and the silver is Silver plate. The charm itself comes in 3 finishes, Rose Gold, Gold, and Silver. It is weighty for it’s size and is slightly smaller than a quarter…more like a nickel. See pics.