The Slytherin locket became an heirloom of his family. It was made with a heavy gold and a serpentine S in glittering green stone inlay. Tom Riddle stole it from Hepzibah Smith when he killed her. However, the locket was his birthright, having belonged to Marvolo Gaunt.
This isn’t exactly the gold with gemstones, but it is an authentic licensed replica from The Noble Collectio as seen in the Deathly Hallows. A collector display box is also included.