16"-18" sterling silver necklace. Peruvian is about .25-4" by .25". Natural stone color & size varies.

Meaning of peruvian opal:

Peruvian opal reduces stress and helps the wearer approach the future with a heightened sense of tranquility. Peruvian opal is also believed to help with issues sleeping. 

Peruvian Opal comes from:

This specific type of opal is the national stone of Peru. This fairly rare opal was named after the country, as the only source found is in the Andes mountains.