14K yellow gold/black onyx/opal/quartz; 17"L; pendant: .38"L; Lobster clasp; Almost all gemstones and black diamonds have been treated to enhance their beauty and require special care; Photo may have been enlarged and/or enhanced; All gemstone carat weights (tcw) are approximate; variance may be 0.05 carat.; Opal is the October birthstone; Made in USA