ALTMANN
Jewellery dealer — Paris
ALTMANNBook an appointment
Art Deco — 1920–1935

Sell Art Deco jewellery

Geometric lines, platinum, old-cut diamonds and contrasts of colour — onyx, coral, emerald, jade: the house seeks Art Deco jewellery actively and buys it outright, signed or not, in Paris at 22 rue Drouot and in London at 100 Hatton Garden.

The house of Altmann

Art Deco, bought at its true value

The style takes its name from the Paris Exposition of 1925 and runs from the early 1920s to the mid-1930s: platinum, diamonds cut in the old way, calibré-cut coloured stones, black and white, and the motifs of Egypt, China and India. The great Paris houses — Cartier, Van Cleef & Arpels, Boucheron, Mauboussin, Lacloche — and Cartier's London workshop, English Art Works, made the pieces now most sought after; so did Paris workshops whose names were never engraved. The house reads the period, the workmanship and the stones before the signature, and makes a firm offer on the piece itself.

What we look for

The Art Deco pieces we buy

Complimentary first opinion on photographs, firm offer, same-day payment. These are the pieces we look for first.

Bracelets

The great diamond bracelets of the 1920s and 1930s — line bracelets, articulated plaques, cuffs — in platinum, with old-cut diamonds and calibré stones; Cartier London bracelets among them.

Clips and brooches

Geometric clips, double clips that join into one brooch, pendant brooches; platinum, diamonds, onyx, coral, jade, rock crystal. Antique brooches (in French).

Rings and solitaires

Platinum mounts with old European, cushion and Asscher cuts; calibré sapphires, rubies or emeralds around the stone.

Pendant earrings and sautoirs

Long earrings, sautoirs of pearls and carved stones, tassels; the pieces of the evening.

Tutti Frutti and carved stones

Rubies, sapphires and emeralds carved as leaves, berries and flowers, India as seen by Art Deco: rare pieces, to be shown before any decision. Cartier.

Signed pieces

Cartier, Van Cleef & Arpels, Boucheron, Mauboussin, Lacloche, Fouquet, Templier, Després, Sandoz — and fine unsigned pieces from Paris workshops, valued for what they are.

Before you come

A photograph is enough to begin

Have you already photographed your piece? Send us that same image: we tell you what it is, then we arrange an appointment in Paris or in London.

I

Photograph

The whole piece in daylight and without flash, then the clasp, the reverse and any marks — a signature, a number, a maker's mark, a hallmark.

II

Send

By WhatsApp on +33 7 81 11 49 29, or by e-mail. You receive a first opinion within 24 hours, complimentary and without obligation.

III

Bring the piece

To 22 rue Drouot in Paris, or to 100 Hatton Garden in London, by appointment. The firm offer is made on the piece itself; payment follows agreement, the same day.

Send a photograph

Your photographs are neither published nor passed on. Remote appraisal, in detail · Selling from the UK and Europe

Appraisal

What gives an Art Deco piece its value

We look at these six points in front of you, then we make a firm offer.

Period and design

A piece of 1925 is not a piece of 1935, and a bold geometric design is not a timid one. The design, the proportions and the way the stones are used date the piece and make its value.

Platinum

The metal of the period. In France it carries the dog's-head hallmark, in use since 1912; in Britain, platinum was not hallmarked before 1975, so an unmarked platinum piece is usual, not a fault.

Old-cut diamonds

Old European cuts, cushions, baguettes and the first emerald cuts, in the original mounting: they are read one by one, and are worth more in their period setting than loose.

Calibré and carved stones

Sapphires, rubies, emeralds, onyx and coral cut to the shape of the design, carved leaves and berries: the quality of the stones and of the setting counts as much as the diamonds.

Condition and originality

A piece in its original state — stones, clasp, articulation — is what is paid for. A converted, shortened or re-set piece is still bought, but read differently. Have nothing polished or repaired before the opinion.

Signature, numbers, marks

“Cartier”, “Van Cleef & Arpels”, “Boucheron”, a serial number, a maker's mark; or none at all. The house reads them in front of you, and a fine unsigned piece is bought for what it is.

Frequently asked questions

Selling Art Deco jewellery

What characterises an Art Deco piece?

Geometric lines, platinum, old-cut diamonds and contrasts of colour — onyx, coral, emerald, jade — between 1920 and 1935.

Does a signature change the value?

Yes: a piece signed by a great house is valued higher. We also buy fine unsigned pieces from the Paris and London workshops of the period.

My Art Deco piece has no hallmark. Is that a problem?

Not for a British piece: platinum was not hallmarked in the United Kingdom before 1975, so an unmarked platinum bracelet or clip from the 1920s is usual, not a fault. The piece is read by its workmanship, its stones and, when it has one, its signature.

A bracelet has been shortened, a brooch converted. Can it still be sold?

Yes. The house buys converted and altered pieces; it reads them differently from pieces in their original state, and tells you so frankly.

Should I have the piece cleaned or repaired first?

No. The original condition is what is paid for; do nothing to the piece before the opinion.

How can I find out what my piece is worth?

Bring it by appointment, or send photographs: a first opinion within 24 hours, complimentary. The firm offer is made on the piece itself.

Can I sell an Art Deco piece in London?

Yes. The house receives in London by appointment at its office, 100 Hatton Garden, EC1N 8NX, in the jewellery quarter. Write first by WhatsApp or e-mail with photographs; the appointment is fixed around the house's visits.

Is payment immediate?

Yes. Once agreement is reached, payment is made the same day, by bank transfer, whatever the amount — with no fees or commission.

Key facts — October 2026

What to know before you come

Verifiable facts, reviewed in October 2026. For a specific case, the appointment settles the matter.

Period: 1920–1935

The style takes its name from the Exposition internationale des arts décoratifs, Paris, 1925. Geometric lines, black-and-white contrasts, Egyptian, Chinese and Indian motifs.

Materials

Platinum, old-cut and calibré diamonds, onyx, coral, jade, rock crystal, enamel. In France the platinum hallmark is the dog's head (1912); in the United Kingdom platinum was not hallmarked before 1975.

Signatures and workshops

Cartier (Paris, London, New York), Van Cleef & Arpels, Boucheron, Mauboussin, Lacloche, Fouquet, Templier, Després, Sandoz — and many fine unsigned pieces from Paris workshops, valued for what they are.

Book an appointment

Show us the piece

Complimentary and confidential first opinion within 24 hours; then an appointment in Paris or London.

Request an opinion+33 7 81 11 49 29
Book an appointment