Art Deco Unheated Ceylon Sapphire and Diamond Brooch in Platinum
Architectural Geometry Illuminated by Rich Blue Sapphires and Diamonds
Bold geometry and exceptional color come together in this striking Art Deco sapphire and diamond brooch, beautifully crafted in platinum.
The compact composition is arranged as a series of interlocking horizontal, vertical and curved forms, reflecting the Art Deco period’s fascination with symmetry and architectural design. Square and rectangular step-cut unheated Ceylon sapphires form the brooch’s strong geometric framework, displaying deep blue color with flashes of vivid brilliance as the piece moves in the light.
Curved platinum sections set with round diamonds soften the linear arrangement while creating a bright contrast against the saturated blue sapphires. An additional round diamond set within a square platinum frame anchors the base of the composition, completing the brooch with a final point of light.
The cool white tone of the platinum setting enhances the whiteness of the diamonds and allows the blue sapphires to remain the visual focus. Open spaces incorporated into the center of the design give the brooch depth and lightness while emphasizing its precise, architectural character.
Measuring approximately 1 inch by 0.7 inch, this is an intimate jewel with a remarkably strong visual presence. Its compact proportions make it suitable for wearing on a lapel, collar, scarf or evening ensemble, either alone or as part of a curated grouping of Art Deco brooches.
Key Features
- Period: Art Deco
- Metal: Platinum
- Gemstones: Unheated Ceylon sapphires and diamonds
- Sapphire Cuts: Square and rectangular step cuts
- Diamond Cut: Round
- Design: Geometric and architectural
- Measurements: Approximately 1 inch by 0.7 inch
- Condition: Excellent estate condition
- Perfect For: Collectors of Art Deco jewelry, unheated sapphires and geometric platinum jewels
Collector’s Note
The combination of unheated Ceylon sapphires, diamonds and platinum is particularly desirable in Art Deco jewelry. The absence of heat treatment preserves the natural character of the sapphires, while their geometric step cuts perfectly complement the period’s clean architectural vocabulary.
Although modest in scale, this brooch possesses the visual impact of a much larger jewel. Its disciplined symmetry, richly colored sapphires and sharply contrasting diamonds make it a sophisticated and highly collectible example of Art Deco design.
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Buy with confidence. Every piece is backed by:
• Authenticity — examined and verified before listing
• Condition — carefully inspected and honestly described
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• 32-day returns — available on eligible, unaltered items
• Private appointments — available in New York
• Experience — over 50 years of fine jewelry expertise
How do I know a piece is authentic, and can I trust DSF?
Buying fine jewelry online takes trust, especially at this level. DSF Antique Jewelry is a New York–based dealer with over 50 years of fine jewelry expertise. Every piece is examined for authenticity and condition before it is listed — we assess hallmarks, maker's marks, metal content, gemstones, and construction consistent with the stated period or designer. For signed pieces such as Cartier, Buccellati, or Van Cleef & Arpels, we verify maker's marks and signatures. We're glad to send additional photographs of any hallmark, or speak with you directly, before you decide.
Why does antique gold look different, and is surface wear normal?
Antique pieces were often made in gold standards less common today, such as 15ct (used in Britain only between 1854 and 1932), 9ct, or higher-karat continental gold, which give a warmer tone than typical modern 14k. Light surface wear, softened edges, and a gentle patina are normal and expected on antique jewelry — they reflect the age and authenticity of the piece, not flaws. We describe the true condition of every item honestly in its listing.
What do the hallmarks and maker's marks mean?
Hallmarks are small stamped marks that identify the metal standard, and often the maker, assay office, and date. They are one of the best tools for authenticating antique jewelry. We identify and explain the marks we find on each piece in its description, and we're happy to send close-up photographs of any hallmark on request so you can see exactly what you're buying.
Can pieces be resized or adjusted?
It depends on the piece. Many antique rings can be resized, but bands with all-around engraving, thin shanks, or gemstones near the base may be limited in how far they can safely go, and some pieces are best left as-is to preserve their integrity. We list each item's measurements as they currently are. If you're unsure whether something can be safely adjusted, contact us before buying and we'll give you an honest assessment for that specific piece.
How should I care for and store fine jewelry?
Clean gently with a soft cloth, avoid harsh chemicals, ultrasonic cleaners, and chlorine, and store pieces separately so they don't scratch one another. Remove rings and bracelets for heavy manual tasks. Antique gold is softer than modern alloys, so period pieces are best enjoyed with normal care. Treated well, fine antique jewelry lasts for generations — many of our pieces are already a century or more old and still beautiful.
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