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sellingantiques.co.uk
ID #SA986995
FOR SALE
£550
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Mid Century Old Cut Diamond & Onyx Pin Brooch, Circa 1960
Gatsby Jewellery Ltd
for sale €644     $699
£550
Gatsby Jewellery Ltd

Gatsby Jewellery Ltd

Sellingantiques Verified Since May 2014
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    Gatsby jewellery are a husband and wife team who have years of knowledge and experience in dealing in fine antique jewellery.
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Mid Century Old Cut Diamond & Onyx Pin Brooch, Circa 1960

1940 - 1960
Description

A splendid vintage brooch with clear influences from the Art Deco period. The old mine cut diamond in the centre is set within a milgrained square platinum setting, with sits within a panel of satin finished white gold. Two bars of onyx angle away from the centre panel, stepping down to a box-set rose cut diamond which conforms to a slender, 18k white gold pin.

Secured with a trombone clasp.

Cut – Old mine cut in the centre, with two small rose cut diamonds in the sides.

Colour – G.

Clarity – VS2.

Carat – Approximately 0.07 total.

Circa – 1960.

Measurements – 59.4 x 6.3mm

Metal – 18k white gold. The diamond is set in platinum. Tested.

Physical Dimensions
Height
30cm (11.81")
Width
25cm (9.84")
Depth
5cm (1.97")
Declaration

Gatsby Jewellery Ltd has dated this Diamond Onyx Bar Brooch to the 1960s.

Reference Numbers
Sellingantiques Reference
SA986995
Dealers Internal Reference
79511S019
Description
A splendid vintage brooch with clear influences from the Art Deco period.
“
The old mine cut diamond in the centre is set within a milgrained square platinum setting, with sits within a panel of satin finished white gold.
Gatsby Jewellery Ltd

Two bars of onyx angle away from the centre panel, stepping down to a box-set rose cut diamond which conforms to a slender, 18k white gold pin.

fig 1. A horizontal platinum bar brooch featuring a central rectangular black onyx panel set with a round diamond and flanked by geometric stepped shoulders.
fig 1. Mid Century Old Cut Diamond & Onyx Pin Brooch, Circa 1960

Secured with a trombone clasp.

Cut – Old mine cut in the centre, with two small rose cut diamonds in the sides.

Colour – G.

Clarity – VS2.

Carat – Approximately 0.07 total.

Circa – 1960.

Measurements – 59.4 x 6.3mm

Metal – 18k white gold. The diamond is set in platinum. Tested.

Height
30cm (11.81")
Width
25cm (9.84")
Depth
5cm (1.97")
Date of Manufacture

Gatsby Jewellery Ltd has dated this Diamond Onyx Bar Brooch to the 1960s.

Reference Numbers
Sellingantiques Ref
SA986995
Dealers Internal Ref
79511S019
Gatsby Jewellery Ltd
Gatsby Jewellery Ltd
Sellingantiques verified Since May 2014

Gatsby jewellery are a husband and wife team who have years of knowledge and experience in dealing in fine antique jewellery.

Dealer Profile

You can view the stock and full dealer information on the Gatsby Jewellery Ltd Profile Page

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A horizontal platinum bar brooch featuring a central rectangular black onyx panel set with a round diamond and flanked by geometric stepped shoulders.
1 / 5
Archive I A horizontal platinum bar brooch featuring a central rectangular black onyx panel set with a round diamond and flanked by geometric stepped shoulders.

Mid Century Old Cut Diamond & Onyx Pin Brooch, Circa 1960

Archive II A horizontal platinum bar brooch featuring a central rectangular black onyx panel set with a round diamond and flanked by geometric stepped shoulders. View II
Archive III A horizontal platinum bar brooch featuring a central rectangular black onyx panel set with a round diamond and flanked by geometric stepped shoulders. View III
Archive IV A horizontal platinum bar brooch featuring a central rectangular black onyx panel set with a round diamond and flanked by geometric stepped shoulders. View IV
Archive V A horizontal platinum bar brooch featuring a central rectangular black onyx panel set with a round diamond and flanked by geometric stepped shoulders. View V
Enlarged Archival View
Gatsby Jewellery Ltd

Gatsby Jewellery Ltd
Telephone 01992 842 123
Location
Gatsby Jewellery Ltd
3 Coppice Row
Theydon Bois
Essex
CM16 7ES
United Kingdom
Dealer Profile Page sellingantiques.co.uk/gatsby
Verified Since May 2014
Items For Sale 261
Items Sold 2,936
Gatsby Jewellery Ltd
Gatsby Jewellery Ltd
Verified Since May 2014
View Dealer Info
Location: Gatsby Jewellery Ltd, 3 Coppice Row, Theydon Bois, Essex, CM16 7ES, United Kingdom
Profile: sellingantiques.co.uk/gatsby
Verified
May 2014
For Sale
261
Sold
2,936
A horizontal platinum bar brooch featuring a central rectangular black onyx panel set with a round diamond and flanked by geometric stepped shoulders.
Mid Century Old Cut Diamond & Onyx Pin Brooch, circa 1960
Ref: SA986995
A horizontal platinum bar brooch featuring a central rectangular black onyx panel set with a round diamond and flanked by geometric stepped shoulders.
Detail View 1
Detail View 2
Detail View 3
Detail View 4
Archival Detail

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FAQs

Mid-century geometric bar brooches feature linear silhouettes, monochrome contrast, and streamlined architectural detailing heavily influenced by earlier Art Deco movements. They emphasize clean horizontal lines, precision gemstone settings, and structured symmetry.

Pieces from this era commonly utilise white gold or platinum mountings combined with carved black onyx plaques and brilliant or old European cut diamonds. Settings often feature millgrain edging and hand-engraved geometric side profiles.

Authentic items feature period-correct metal hallmarks, trombone or safety swivel pin catches, and hand-finished stone mountings. The diamond cuts typically reflect historical faceting styles, set cleanly into polished gemstone channels.

A geometric bar brooch can be pinned to tailored blazer lapels, secured on heavy silk scarves, or attached to the waistline of a modern evening dress. It can also be displayed on velvet cushions inside modern glass jewellery frames.

Clean gently using a soft lint-free cloth moistened with warm water and mild soap, avoiding chemical immersion. Ultrasonic cleaners must be avoided as black onyx is a porous gemstone prone to surface scratching or fracturing under vibration.
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