Blue topaz: 8mm x 6mm; 14K yellow gold; 18-19.5" adjustable length; pendant: .2"L; Lobster clasp; Almost all gemstones and blue 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.; Imported