Check the jewelry's weight and 925 silver designations. According to Tiffany's official website, in 1851, Tiffany became the first American company to use the 925/100 weight standard for its jewelry. Authentic tiffany silver jewelry pieces are engraved with the 925-weight designation on the front or back of each piece of jewelry and on the clasp. A faux Tiffany necklace will also weigh considerably less than the real Tiffany necklace's standard weight of 72 grams.


