7.50ct Onyx and 3.20ct Diamond, Platinum Brooch - Art Deco - Antique Circa 1920

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A stunning, fine and impressive antique Art Deco 7.50 carat onyx, 3.20 carat diamond and platinum brooch; part of our diverse onyx jewellery collections.

This stunning antique black onyx brooch has been crafted in platinum.

The navette shaped, pierced decorated Art Deco style design displays a feature marquise shaped cabochon onyx, claw set to the centre.

This central gemstone is flanked on either side with two horizontal pales ornamented with seventy-two pavé set eight cut diamonds, terminating with horizontal claw set pear shaped cabochon cut onyxes.

The outer geometric frame of this impressive 1920s brooch is embellished with a further twenty-eight eight-cut diamonds.

This stunning Art Deco onyx brooch with diamonds brooch secures to the reverse with a hinged pin and clasp.

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

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

This stunning brooch is the finest of its type you could hope to acquire; the retailer's mark to the pin indicates the high quality of the piece.

This navette onyx and diamond brooch with diamonds exemplifies the dramatic elegance of Art Deco design, equally striking on a lapel, gown or scarf. This piece would be compelling as part of a discerning antique collection.

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 stunning antique brooch is excellent quality, set with impressive black onyx displaying fine colour and presence.

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

This antique onyx brooch is an excellent gauge of platinum and is in excellent condition.

Reflections in photographs may detract from the true representation of this impressive example of antique onyx jewellery.

Onyx Quality:
Cut Cabochon
Content 7.50 carats

Diamond Quality:
Colour (average grades) G
Clarity (average grades) SI2
Cut Eight
Content 3.20 carats

Number of Diamonds: 100

Dimensions:
Length of setting 5.95cm/2.34"
Width of setting 2.85cm/1.12"
Across pin 5.2cm/2.05"
Height of setting 6.71mm/0.26"

Weight: 10.74 grams
Date: Circa 1920