TLC Carved Chinese heart pendant necklace

TLC Carved Chinese heart pendant necklace Looks like Chinese jade with that opaque pale celadon green colour but I believe this is another stone. It’s hard and cold. New. Vintage c. 1970s-1980s. Gold tone bail. Hallmark on bail: “?????” Can’t read it C. 20x20 mm heart. Probably hand carved and / or polished. From China. Note: there is a chip on the side.