What is an Art Deco jewel worth?

Period authenticity vs. inspired later work

In auction catalogues, a strict distinction is made between 'Art Deco, circa 1925' and 'in Art Deco style, circa 1970'. This difference is not cosmetic. A genuine period piece was made at a time when the technique, materials, and craftsmanship were unique and cannot be reproduced without it being noticeable.

Later reproductions are almost always made in white gold; white gold only became common after the Second World War. If you find a hallmarked platinum ring with old-brilliant or old-European cuts? Then there's a good chance you're dealing with a period piece.

Platinum versus white gold

In the 1920s, platinum was the precious metal of haute joaillerie. It feels heavier in the hand than white gold of comparable dimensions, and is hallmarked with a mercury head (France), swan (small French work), or Dutch platinum hallmark. The choice of metal itself is therefore one of the strongest dating indicators.

White gold in the same design language is decorative but is treated fundamentally differently in appraisal. Expect roughly a factor of two to four difference for comparable designs.

Geometry and symmetry

Pure Art Deco forms — shield, octagon, baguette compositions, pyramidal clusters — are typical. The stricter and more composite the design, the higher the appreciation. A symmetrical shield motif with calibré-set onyx or sapphire is structurally valued higher than a comparable piece with a loose, less strictly executed composition.

Old brilliant and baguette cuts

Old brilliant cuts (old European cut) and old mine cuts are appraised separately from modern brilliant cuts. They are hand-cut, have a small table, and a visible culet at the bottom. For enthusiasts, this is precisely the difference from a modern stone — the fire dispersion is warmer and broader.

Baguettes from the period are often slightly irregular; perfectly uniform baguettes indicate later machine production.

Calibré-set stones and completeness

Calibré-cutting — where each stone is precisely cut to fit seamlessly into the setting — is a hallmark of true period jewellery artistry. Missing stones, later repairs with modern stones, or replaced clasps depress the value. A complete, unaltered piece is considerably more valuable — sometimes twice as much as the same model with a repair.

What unexpectedly depresses the value?

Ring sizes that have been enlarged with a modern shank, older stones replaced by modern brilliant cuts, and brightly polished platinum (which removes the original patina and engraving) are the most common value depressors. When in doubt: have the piece assessed in its unaltered state before commissioning any restoration.

Chemical cleaning at home is also not recommended. The patina in the engraved lines is part of the evidence for an appraiser that the piece is old; polishing it away can give the impression that you are dealing with a reproduction.

Signature and provenance

Names like Cartier, Van Cleef & Arpels, Boucheron, or Lacloche add enormous value — provided they are verifiable with documentation, a number, or archival records. For these pieces, it always pays to seek a second opinion from an appraiser with auction experience. We deliberately do not display logos here; we only mention brand names as text.