The back is stamped with the TASAKISHINJU company mark, K18, 0.29, and 0.02. It has been stored in a velvet jewelry box, so I don't think there are any noticeable scratches. Total weight: 5g (Measured with a home scale, so there may be slight variations. Please understand.) 0.29 (stone) 0.02 (stone) Length: Approximately 42cm including the stones. TASAKI has "experts" with an eye for pearls, diamonds, and colored stones. They select only gemstones that meet strict quality standards, such as the vividness, color, and the presence or absence of inclusions within the colored stones. Due to the nature of the product, returns are not accepted.