What defines Art Deco jewellery from the 1920s?

Art Deco jewellery from the 1920s is characterised by geometric structure, linear patterns, and crisp symmetry. Fine pieces from this era frequently combined high-carat gemstones with platinum mountings, openwork filigree, and accent diamonds.

What materials and construction techniques were used in 1920s brooches?

High-end 1920s brooches were predominantly crafted in platinum to allow for delicate, strong settings. Common construction details included millegrain borders, pierced openwork galleries, and step-cut primary gemstones paired with round brilliant or single-cut accent diamonds.

How do you identify authentic Art Deco gemstone jewellery?

Authentic Art Deco pieces typically show era-appropriate hallmarks, hand-finished millegrain edges, geometric gemstone cuts, and fine platinum craftsmanship. Inspection of the reverse setting reveals intricate structural work and period attachment mechanisms such as dual-purpose pin and pendant fittings.

How to style this item in a modern interior?

In a modern interior, fine antique jewellery can be incorporated into a dressing room or vanity space by displaying it within a velvet-lined glass shadow box. Staging the piece atop a marble tray alongside period accessories creates an elegant decorative vignette.

How should antique aquamarine and platinum jewellery be cleaned and preserved?

Clean aquamarine and platinum jewellery using warm water, gentle liquid soap, and a soft brush, avoiding chemical cleaners or steam treatments. Store the item individually in a fabric-lined box to protect the platinum finish and prevent harder gemstones from causing scratches.

for sale €11,642 $12,637

£9,950

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Antique 42.24ct Aquamarine, 1.62ct Diamond and Platinum Brooch / Pendant Circa 1920

Name: Antique 42.24ct Aquamarine, 1.62ct Diamond and Platinum Brooch / Pendant Circa 1920
Brand: Antique
SKU: SA1076171
Price: 9950 GBP
Availability: InStock

1900 - 1920

For Sale by AC Silver

Description

A stunning, fine and impressive antique 42.24 carat aquamarine, 1.62 carat diamond and platinum brooch / pendant; part of our antique aquamarine jewellery collections.

This stunning, fine and impressive 1920s brooch/pendant has been crafted in platinum.

The pierced decorated, rectangular shaped setting displays a stunning feature millegrain decorated collet set 42.24ct emerald cut aquamarine.

The feature aquamarine is encompassed with sixteen collet set Old European round cut diamonds, subtly protruding from the central setting.

The pierced decorated frame of the brooch is further ornamented with an inverted arch border incorporating forty-eight pavé set diamonds, in a combination of eight and Dutch cuts.

The brooch secures to the reverse with a detachable hinged pin and push fit clasp; the detachable pin indicates the high quality of the piece.

This versatile antique brooch may also be worn as a pendant and suspended from an 18' platinum trace chain via an integrated loop to the reverse of the setting.

This impressive aquamarine brooch/pendant has been independently tested using state of the art technology (Niton XL2 Analyzer) and verified as platinum.

This stunning brooch is supplied with an IDGL diamond and gemstone grading report card.

This stunning brooch is a work of art in its own right.

Images do not always reflect the true colour and brilliance of gemstones and diamonds. The video however provides a truer representation of the actual colour and showcases each stone.

Condition

This antique brooch/pendant is exceptional quality, set with a stunning aquamarine displaying fine colour, brilliance and presence.

The well colour matched, high colour graded diamonds display a fine white colour and brilliance.

This aquamarine brooch is an exceptional gauge of platinum and is in exceptional condition.

Reflections in photographs may detract from the true representation of this stunning 1920s aquamarine and diamond brooch.

Aquamarine Quality

Cut Emerald

Content 42.24 carats

Dimensions 22.10mm (length) x 20.25mm (width) x 12.96mm (depth)

Diamond Quality

Colour (average grades) H

Clarity (average grades) SI2

Cut Old European/Eight/Dutch

Content 1.62 carats

Number of Diamonds

64

Dimensions

Length of setting 3.35cm/1.32'

Width of setting 3.1cm/1.22'

Across pin 2cm/0.79'

Height of setting 1.29cm/0.51'

Weight

22.82 grams

Date: Circa 1920

A video is available upon request.

Physical Dimensions

Height

1.3cm (0.51")

Width

3.1cm (1.22")

Depth

3.4cm (1.34")

Declaration

AC Silver has dated this Art Deco Aquamarine Brooch to the 1920s.

Reference Numbers

Sellingantiques Reference

SA1076171

Dealers Internal Reference

C8678

Dealers Notes

PLEASE NOTE: AC Silver takes pride in offering only quality items for sale.

This pride in quality includes the professional, efficient and personal service extended to all AC Silver customers.

All items purchased usually dispatched within 24 hours following cleared payment.

All items are professionally and securely packaged, sent FREE of charge and are FULLY INSURED during transit.

FREE worldwide international deliveries are via FedEx International Priority Service.

AC Silver is pleased to provide a 30-day money back guarantee.

Description

A stunning, fine and impressive antique 42.24 carat aquamarine, 1.

“

62 carat diamond and platinum brooch / pendant; part of our antique aquamarine jewellery collections.

AC Silver

This stunning, fine and impressive 1920s brooch/pendant has been crafted in platinum.

fig 1. An Art Deco platinum brooch centered with a large square emerald-cut light blue aquamarine surrounded by a decorative openwork diamond border. — fig 1. Antique 42.24ct Aquamarine, 1.62ct Diamond and Platinum Brooch / Pendant Circa 1920

The pierced decorated, rectangular shaped setting displays a stunning feature millegrain decorated collet set 42.24ct emerald cut aquamarine.

The feature aquamarine is encompassed with sixteen collet set Old European round cut diamonds, subtly protruding from the central setting.

fig 2. An Art Deco platinum brooch centered with a large square emerald-cut light blue aquamarine surrounded by a decorative openwork diamond border. — fig 2. Antique 42.24ct Aquamarine, 1.62ct Diamond and Platinum Brooch / Pendant Circa 1920

The pierced decorated frame of the brooch is further ornamented with an inverted arch border incorporating forty-eight pavé set diamonds, in a combination of eight and Dutch cuts.

The brooch secures to the reverse with a detachable hinged pin and push fit clasp; the detachable pin indicates the high quality of the piece.

fig 3. An Art Deco platinum brooch centered with a large square emerald-cut light blue aquamarine surrounded by a decorative openwork diamond border. — fig 3. Antique 42.24ct Aquamarine, 1.62ct Diamond and Platinum Brooch / Pendant Circa 1920

This versatile antique brooch may also be worn as a pendant and suspended from an 18' platinum trace chain via an integrated loop to the reverse of the setting.

This impressive aquamarine brooch/pendant has been independently tested using state of the art technology (Niton XL2 Analyzer) and verified as platinum.

fig 4. An Art Deco platinum brooch centered with a large square emerald-cut light blue aquamarine surrounded by a decorative openwork diamond border. — fig 4. Antique 42.24ct Aquamarine, 1.62ct Diamond and Platinum Brooch / Pendant Circa 1920

This stunning brooch is supplied with an IDGL diamond and gemstone grading report card.

This stunning brooch is a work of art in its own right.

Images do not always reflect the true colour and brilliance of gemstones and diamonds. The video however provides a truer representation of the actual colour and showcases each stone.