0.50 or 1.0 total carat weight; 14K gold or rose gold; 0.15" or 0.22"L; Post back; 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.; Some black diamond jewelry may be set with black rhodium-plated metal; it may wear off over time requiring replating.