Art Deco Platinum Diamond Emerald Onyx Brooch
Art Deco Platinum Brooch Set with Diamonds, Emeralds and Onyx
This refined Art Deco platinum brooch brings together three classic elements of period jewelry design: brilliant diamonds, vivid emeralds, and polished black onyx. Measuring 2 inches in length by 1 inch in width, the brooch has an elegant horizontal form with strong geometric lines, openwork details, and the bold contrast so closely associated with the Art Deco era.
The platinum design is beautifully set with diamonds, arranged in graceful curved sections that create light, movement, and dimension across the piece. The polished black onyx frame adds depth and architectural definition, while the emerald details provide a striking touch of color. This combination of black, white, green, and platinum gives the brooch a sophisticated and highly collectible Art Deco character.
The composition is balanced and distinctive, with the open center creating a sense of lightness while the diamond-set platinum work adds brilliance throughout the design. The emeralds are placed as elegant color highlights, enhancing the brooch without distracting from its crisp geometric structure. The result is a jewel that feels both refined and visually memorable.
With its fine materials, period-inspired geometry, and elegant proportions, this diamond, emerald and onyx brooch is a beautiful choice for collectors of Art Deco jewelry, platinum brooches, and distinctive vintage jewels. It can be worn on a jacket lapel, dress, scarf, or evening ensemble, adding a polished and sophisticated accent to any look.
Key Features
• Period: Art Deco
• Metal: Platinum
• Gemstones: Diamonds and emeralds
• Accent Material: Black onyx
• Design: Geometric Art Deco brooch set with diamonds, emeralds, and framed by black onyx
• Dimensions: 2 inches long by 1 inch wide
• Style: Elegant, architectural, collectible
• Condition: Excellent condition
A striking example of Art Deco elegance, this platinum diamond, emerald and onyx brooch combines bold contrast, fine gemstone detail, and sophisticated geometric design in a beautifully wearable jewel.
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The DSF Promise
Buy with confidence. Every piece is backed by:
• Authenticity — examined and verified before listing
• Condition — carefully inspected and honestly described
• Insured shipping — fully insured, signature required
• 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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