This is a Tiffany & Co. By the Yard necklace. The diamond carat is 0.19 carats. The necklace length is approximately 41cm. It is made of 750 (K18) yellow gold. The clasp plate is engraved with Tiffany & Co., Peretti, 750, and an 8-digit serial number. The diamond is set with a very brilliant stone. My mother bought it at Isetan 10 years ago and gave it to me as a gift, but I only wore it for a short time once and have kept it in storage since. I couldn't find the certificate of authenticity, so it is not included, but it was triple excellent, F color. It is in very beautiful condition. The included accessories are the box and necklace case shown in the images.