The listing, Silvertone blue heart pendant and earring set has ended.
I cannot tell you what metal the chain, pendant, and earrings are made of. The blue looks more like an enamel than a stone. The chain is approximately 24" long. The pendant about 1-1/2" X 1-1/2". The earrings are a little over a 1/4" X 1/4". This is a pretty set and I don't even think I wore the earrings, as I can only wear sterling silver or gold, myself.