Art Deco vs Art Nouveau jewelry: how to tell the two styles apart

The names sound alike and the periods almost touch, but the two styles want opposite things. Art Nouveau curves, Art Deco squares off. Art Nouveau looks at plants and women's hair, Art Deco looks at architecture and machines. Once you have that in your head, most pieces sort themselves in a second or two.

The one line version

Art Nouveau, roughly 1890 to 1910: flowing asymmetric curves, insects and flowers, dreamy female faces, enamel, and materials chosen for how they look rather than what they cost.

Art Deco, roughly 1920 to 1935: hard geometry, symmetry, sharp contrast, platinum and diamonds, coloured stones cut to fit exactly into their settings.

Between them sits the Edwardian or Belle Epoque period, roughly 1901 to 1915, which is neither: pale, lacy, platinum garland work. It overlaps Art Nouveau in date but not in spirit, and it is the reason some pieces feel like they belong to both decades at once.

Art Nouveau in detail

Art Nouveau was a reaction against Victorian formality and against machine made sameness. The jewellers who defined it, above all Rene Lalique in Paris, treated a brooch as a small sculpture rather than a way to display a valuable stone.

Lines. Nothing is straight and nothing is quite symmetrical. The signature is the whiplash curve, a long S that swells and narrows like a stem bending in wind. If you can fold the piece down the middle and both halves match exactly, it is probably not Art Nouveau.

Motifs. Nature, but nature at its strangest. Dragonflies, beetles, moths, peacocks, orchids, irises, poppies, mistletoe, thistles. Female faces with hair that turns into water or leaves. Some pieces are deliberately unsettling, and that was the point.

Materials. This is the part that surprises people. Art Nouveau jewellers used horn, glass, moulded paste, opal, moonstone, baroque pearls and enamel, often in pieces where a diamond would have been affordable. Value was in the design and the craftsmanship.

Enamel. Plique a jour is the technique to know. Enamel is suspended in an open framework with no metal backing, so light passes through it like a stained glass window. It is fragile, it is difficult, and it is very hard to fake convincingly. Held up to a window, a genuine plique a jour wing glows.

Art Deco in detail

Art Deco arrived after the First World War with the opposite instinct. Order instead of dream, edges instead of curves, and a frank enjoyment of expensive materials.

Lines. Straight, stepped, repeated, symmetrical. Rectangles, triangles, chevrons, sunbursts, zigzags. Skyscraper shapes appear in brooch and pendant outlines.

Contrast. White metal against black or strong colour. Onyx and diamond is the classic pairing. Coral and onyx, jade and diamond, sapphire and diamond all belong to the period.

Metal. Platinum first, and white gold once it became widely available in the 1920s. Yellow gold falls out of fashion almost entirely until the Retro period of the late 1930s brings it back.

Stones. This is the strongest single tell. Art Deco jewellers used calibre cut stones, meaning small coloured stones cut to the exact shape of the channel they sit in, so the colour reads as a continuous line with no gaps. Baguettes, emerald cuts, triangles and half moons all belong here. Alongside them sit transitional cut diamonds, the step between old European and modern brilliant, which our guide to antique diamond cuts covers in detail.

Egypt. Tutankhamun's tomb opened in 1922, and scarabs, lotus flowers and papyrus motifs flooded into jewelry for a decade afterwards. An Egyptian revival piece in hard geometry is almost always Art Deco rather than Victorian Egyptomania, which is softer and usually gold.

Six questions that separate them

Work through these with the piece in your hand.

1. Is it symmetrical? Symmetry points to Deco, asymmetry to Nouveau.
2. Are there any straight lines at all? Nouveau avoids them. Deco is built from them.
3. What colour is the metal? Yellow gold or silver suggests Nouveau. Platinum or white gold suggests Deco.
4. Is there enamel? Large areas of translucent or opalescent enamel point to Nouveau. Deco uses enamel, but usually as a flat black or a hard graphic block.
5. How are the coloured stones cut? Cabochons and irregular shapes suggest Nouveau. Stones cut to fit a channel exactly suggest Deco.
6. What is the subject? A living thing suggests Nouveau. A pattern suggests Deco.

If four or more answers land on the same side, you have your era.

Revivals, and how not to be fooled

Both styles were revived. Art Nouveau came back in the late 1960s and 1970s alongside the psychedelic poster, and Art Deco has been revived more or less continuously since the 1970s, with a strong wave in the 1980s.

The giveaways are usually mechanical rather than stylistic.

• Findings. A brooch with a modern rollover safety catch and a pin that stops flush with the body is not from 1905. Period brooches usually have a long pin that extends past the frame, and often a simple C hook.
• Stone cuts. Modern round brilliants in a supposedly 1925 ring are a problem. Period pieces contain period cuts, with a visible culet, unless stones have been replaced.
• Casting. Original work of both periods was largely hand fabricated, chased and hand engraved. Soft, slightly blurred detail with a grainy surface usually means a cast copy taken from an original.
• Metal. White gold in a piece claiming to be 1900 is wrong, because it was not commercially available until around 1915.

Our era by era dating guide goes through findings and construction clues in more depth, and they are more reliable than style on its own.

What each style is worth

Art Nouveau is the rarer of the two. Much of it was made in small workshops, a lot of it was fragile, and enamel chips. Signed work by the major names sits in a different market entirely, but even unsigned pieces with intact plique a jour or fine enamel are sought after. Damage matters more than usual: a chipped enamel wing is very difficult and very expensive to restore invisibly.

Art Deco is more plentiful and more wearable, and it has been consistently fashionable for forty years. Platinum and diamond pieces carry a material floor underneath the design value. Condition questions here are usually about replaced stones and worn millegrain, the tiny beaded edge that softens with wear.

For both, originality is the thing collectors pay for. A piece with its original stones, original findings and honest wear is worth more than the same piece polished bright and refitted.

Buying either one second hand

Ask for a photograph of the back. On both styles, the back tells you more than the front: how the piece was made, whether the settings have been disturbed, whether a catch has been replaced, and whether there are marks.

Ask directly about repairs, replaced stones and enamel losses. A seller who has looked will know. Read the condition notes, and treat vagueness as a reason to ask again rather than a reason to walk away.

Then buy somewhere the money is held until the piece is in your hands. On Nextmine, payment sits with Stripe until you have received the piece and confirmed it, and the seller is not paid before that. You can read the mechanics on our how payments work page, or see what is listed right now.

The Hallmark Society has longer pieces on Art Deco and Art Nouveau separately, each with the checks that separate period work from later copies.