Antique Art Deco Mourning Brooch Compact Locket, Black Onyx Cabochon, Marcasite Floral Spray, Hidden Vanity Mirror, Sterling Grade White Metal, 1920s-1930s

It opens. Not everyone knows that.

From the front, this reads as a very fine Art Deco brooch: a large polished cabochon of deep black onyx, set in a wide silver bezel rimmed with a continuous row of marcasite in geometric mounts, punctuated by larger diamond-form marcasite clusters at intervals around the frame. Applied to the stone face, a three-dimensional silver floral spray with marcasite-set petals radiates outward from a central floret, flanked by scrolling leaf motifs. The whole thing is done with the confident geometry and restrained glamour of the 1920s and 1930s at their most accomplished.

Then you find the hinge.

The piece opens to reveal a hidden interior vanity mirror, purpose-built for the flapper era when it became, for the first time, socially acceptable for women to touch up their makeup in public. Jewellers responded with a short-lived category of wearable secret compacts, brooches engineered with concealed vanity mechanisms that allowed a discreet mirror check without reaching for a handbag. These hybrid brooch-compacts were made for a specific cultural moment and were never common even then. They are considerably rarer now.

The materials tell a second story. Black onyx and marcasite were the established language of Victorian mourning jewellery, worn to signal grief and remember the dead. By the time Art Deco arrived, that tradition had not disappeared so much as transformed: the same stones, the same dark-and-bright contrast, recast in geometric modernist forms. This piece sits at precisely that intersection, mourning aesthetics in the body of a flapper-era object, carrying grief forward into a decade that was trying very hard to forget.

The interior mirror has significant age cracking and breaking, clearly visible in the photographs and consistent with a century of existence. This is well-documented and should be reviewed carefully before purchasing. The structure of the piece is sound, the hinge functions cleanly, and the marcasite and floral spray are intact. Un-hallmarked but professionally acid-tested and confirmed to sterling grade quality.

The Particulars:

• Type: Mourning brooch compact locket with hidden interior vanity mirror
• Stone: Polished black onyx cabochon, set in wide silver bezel
• Decoration: Applied marcasite floral spray to stone face, marcasite geometric border to frame
• Metal: Sterling grade white metal, un-hallmarked
• Era: Art Deco with mourning jewellery tradition, c.1920s to 1930s
• Marks: None. Acid-tested to sterling grade.
• Interior: Vanity mirror with significant cracking and breaking throughout, clearly visible in photos.
• Closure: Original pin-back mechanism
• Condition: Age wear and oxidation throughout, consistent with period. Interior mirror significantly cracked and broken. Exterior structure and hinge sound. Please review all photos carefully before purchasing.

A wearable secret from a decade that invented the idea of touching up in public, dressed in the colours of grief. The mirror is broken with age. The brooch, however, is still doing its job.

Arrives tucked inside its own treasure coffin and carefully wrapped as a vault relic, ready for gifting or keeping.