The Art Deco period produced the most architecturally perfect jewelry the world has ever seen — and this engraved Cartier platinum brooch is a supreme example of that golden era at its height. Geometric, precise, and strikingly complex, it is a rare survivor of Cartier's most celebrated design period, carrying nearly a century of history and undiminished beauty.

A natural, unheated square step-cut sapphire — the most coveted designation a sapphire can carry — anchors the composition at center, flanked by baguette diamonds extending into an elongated openwork platinum frame blanketed with 154 old European-cut round diamonds and 12 straight baguettes, with elegant black enamel accents completing the design.

For the serious collector, a signed Art Deco Cartier brooch set with a natural unheated sapphire is among the rarest acquisitions available — a convergence of period, maker, and stone quality that does not come twice.

Item: Brooch/Pin
Brand: Cartier
Period: Art Deco
Material(s): Natural Unheated Sapphire, Diamonds, Black Enamel, Platinum
Metal: Platinum
Gross Weight: Not Determined
Estimated Weight (Sapphire): Not Determined
Sapphire Cut: Square Step-Cut
Diamond Cut: Old European Round & Straight Baguette
Diamond Count: 154 Round Old European-Cut; 12 Straight Baguettes
Source/Origin (Sapphire): Mined; Not Determined
Enhancement (Sapphire): None (Natural Unheated)
Source/Origin (Diamonds): Mined; Not Determined
Enhancement (Diamonds): Not Determined
Signatures & Marks: Engraved "Cartier"
Provenance: Not Determined
Report(s): None on File

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