Costume Jewelry Marks: Trifari, Coro, Weiss and the Signatures Worth Money

Costume jewelry's revolution: value by design house, not material. A rhinestone brooch is flea-market change unsigned and a collector lot signed — the signature literacy:

The signatures to know

• Trifari: the aristocrat — "Trifari" with a crown above the T (the crown itself dates: used from the 1930s; "©" after 1955). Crown Trifari jelly-belly and fruit-salad pieces lead the market.
• Coro / Corocraft / Vendôme: the volume giant and its premium lines — Coro Duettes (double-clip brooches) are the famous form.
• Miriam Haskell: wired baroque-pearl artistry — early pieces unsigned (attribution by construction: hand-wired to filigree backs), horseshoe plaque marks later.
• Weiss, Eisenberg (Originals then Ice), Schiaparelli, Boucher (with inventory numbers), Hobé, Har (fantasy dragons), Juliana/D&E (unsigned — identified by five-link construction and open-back rhinestones), Sherman (Canada), Christian Dior (dated marks! year stamped = gift), Chanel (era-coded plaques, heavily faked).
• "Sterling" on costume: WWII years — base metals went to war, so 1942–47 pieces run sterling silver, a dating anchor.

Dating tricks

Patent numbers on clasps decode to years via US patent tables (Coro and Trifari used them heavily — a "Des. Pat." number dates the design's filing); © symbol = post-1955 (the costume industry's copyright shift); clasp engineering evolves (C-clasp → safety → clip mechanisms); and material eras (early plastics, rhodium plating's rise, aurora borealis stones = post-1955 by definition).

Evaluating the unsigned

Most costume is unsigned; quality tells anyway: weight and plating (rhodium gleam vs pot-metal), stone setting (prong-set beats glued; open backs on quality rhinestones), construction (hand-wiring, layered dimensionality, finished backs — the back is the résumé), and design-attribution communities that match unsigned pieces to documented lines (Juliana collecting is entirely this).

Fakes and frankenjewelry

Big signatures get counterfeit stamps (Chanel and Trifari especially — fake-mark rules apply: mark font/placement vs documented examples, quality coherence); "married" pieces recombine parts; and re-plated/re-stoned pieces trade below original condition (the restoration math applies to sparkle too).

Workflow

Macro the mark and the back; the Antique Identifier app matches signatures, patent-number formats and construction era; sold comps by maker-line — the costume market is deep and documented — finish the pricing.

The bottom line

Flip it over: crowns, patents and © symbols date; signatures tier; backs testify. Costume jewelry is the cheapest field in which reading tiny print pays this well.

Values mentioned in this guide are indicative ranges from public auction and marketplace results; condition, provenance and market timing move them substantially. For insurance or estate purposes, get a written appraisal from a certified appraiser.