A $4 thrift store purchase left one shopper questioning whether she had found a far more valuable piece of jewelry. Several viewers believed the necklace resembled an Elsa Peretti design. That is an Elsa Peretti piece! Determining a jewelry piece’s value usually requires more than a visible stamp, with factors such as the metal, craftsmanship, condition, and documentation also considered. For now, Emily’s necklace remains an intriguing find rather than a confirmed $2,500 Tiffany piece.