How to authenticate Tiffany & Co.

About Tiffany & Co. Authentication

Tiffany & Co. has produced sterling silver and gold jewelry in New York since 1837. The brand uses a consistent hallmarking system that has evolved through distinct eras — understanding which era a piece belongs to determines which stamps to expect. Tiffany does not use a unique consumer-verifiable serial number on most pieces; authentication centers on hallmark quality, metal purity, and construction precision. The Return to Tiffany heart tag, the T collection, the Atlas ring, and the Elsa Peretti Bean pendant are among the most counterfeited pieces.

Key authentication signals

• Hallmark stampings and ampersand. All authentic Tiffany pieces carry one of these brand stamps: "TIFFANY & CO." (with ampersand), "T & CO." or "T&CO." The ampersand is mandatory — counterfeits frequently substitute "AND" or omit it entirely. The stamp is precision-applied with consistent depth and beveled character edges; a rounded or blurry stamp edge indicates non-authentic production.
• Metal purity marks. Sterling silver pieces are stamped "925" or "STERLING." Gold pieces carry "750" for 18k or "585" for 14k (rare, mostly vintage). Platinum pieces are stamped "PT950" or "950." These marks appear adjacent to the brand stamp — their absence or use of non-standard purity values (e.g., "800" on a claimed sterling piece) is a definitive fake signal.
• Return to Tiffany tag font. The oval Return to Tiffany heart tag reads "PLEASE RETURN TO TIFFANY & CO. NEW YORK" around the exterior. The words are evenly spaced with correct spacing between all characters; specifically, no two words run together. Counterfeit tags frequently merge "RETURN" and "TO," or alter the phrase to "RETURN TO TIFFANY" omitting "PLEASE" or "& CO."
• Engraving precision on interior surfaces. Interior surfaces of rings and the reverse of pendants carry sharp, consistently-depth engraving. Tiffany bevels the corners of their stamp impressions — each letterform has a slight angled cut at the base rather than a straight perpendicular wall. This beveling is visible under 10x magnification and is absent on most counterfeit pieces.
• Weight and metal density. Authentic sterling silver is dense — a Tiffany sterling ring or bangle has a satisfying, hefty feel disproportionate to its size. Counterfeits use white metal alloys or silver-plated base metal that feel noticeably lighter. A small magnet test confirms: sterling silver is non-magnetic; magnetic pull indicates base metal content.

Hallmarks and serial markers

Tiffany pieces carry no consumer-verifiable serial numbers on most standard production items. The brand stamp, metal purity mark, and (for vintage pieces) a date letter or maker's mark are the standard inscriptions. Certain limited edition or custom pieces carry additional engraved codes, but these are not publicly decodable. For pre-1965 pieces, Tiffany used a date code system recorded in specialized archives. The absence of a serial number on standard Tiffany jewelry is the expected condition, not a red flag.

Common counterfeit red flags

• Brand stamp reads "TIFFANY AND CO." or "TIFFANY CO." without an ampersand or period structure.
• Sterling silver purity mark is absent or replaced with "800" or "Silver" without a numeric purity code.
• Return to Tiffany tag text merges words together or omits "PLEASE" from the inscription.
• Piece shows magnetic attraction to a small magnet, indicating base metal beneath any silver plating.