Vintage Betty Cooke Attributed Estate 14K Gold Onyx Diamond Modernist Brooch Pendant Necklace

Measurements:  1"L x 1.1"W x .4"Thick (2.54cm x 2.79cm x 1.02cm)

Chain: 16.25"L (41.28cm)

Markings: Brooch: 14k  

Chain Markings: Italy • ★ 57 AR • 14K — S.I.L.O. (Società Italiana Lavorazione Oro), Arezzo, Italy

Weight: 7.6g

A striking and highly collectible example of American modernist jewelry, this sculptural 14K yellow gold, black onyx and diamond convertible brooch/pendant is attributed to celebrated Baltimore jewelry designer Betty Cooke.

The piece was acquired directly from Rago Wright as part of a group specifically cataloged by the auction house as jewelry by Betty Cooke, giving it significant documented provenance. The brooch/pendant itself is unsigned and marked 14K, an important detail that has been fully disclosed.

The design is quintessentially modernist, combining a substantial polished black onyx plaque with two overlapping geometric forms of warm 14K yellow gold. Contrasting satin and polished finishes create subtle movement across the gold surfaces, while the offset, layered construction gives the piece a wonderfully architectural three-dimensional quality.

Rising from the black onyx is a single old mine-cut diamond, estimated by Rago Wright at approximately 0.10 carat, creating a beautifully restrained point of brilliance, against the dramatic dark stone. Rather than overwhelming the composition, the diamond becomes part of the geometry — a small flash of light within an otherwise minimalist sculptural design.

The strong contrast of black onyx, yellow gold and diamond, together with the asymmetrical arrangement of the overlapping planes, beautifully reflects the clean geometry and sophisticated material relationships associated with mid-century and late-20th-century studio jewelry.

Designed as a convertible jewel, the piece may be worn either as a brooch or as a pendant, making it exceptionally versatile.

I have paired the brooch/pendant with a vintage 14K yellow gold Italian chain, added separately after its acquisition from Rago Wright. The chain is marked Italy • ★57 AR • 14K and was selected to complement the pendant's clean modernist lines. The chain was not part of the original Betty Cooke auction lot.

A rare and sophisticated piece of wearable sculpture for the collector of Betty Cooke, American modernist jewelry, studio jewelry, architectural design, or important 20th-century fine jewelry.

Provenance:

Acquired from Rago Wright in a group cataloged as jewelry by Betty Cooke. The individual brooch/pendant is unsigned and marked 14K.