Antique Marcus & Co. 9.15 CTW Diamond Crescent Gold Brooch
A Signed Marcus & Co. Antique Crescent Brooch Set with 9.15 Carats of Diamonds
This impressive antique diamond crescent brooch by Marcus & Co. is crafted in 18K yellow gold and set with approximately 9.15 carats total weight of diamonds.
The diamonds are arranged in a beautifully graduated crescent, increasing in scale toward the center and creating a strong sense of balance and brilliance. The open crescent silhouette gives the brooch an elegant architectural presence while allowing the diamonds to remain the dominant visual element.
Viewed from the reverse, the finely constructed gold setting reveals the careful workmanship behind the jewel, with individual open-backed settings supporting the graduating diamonds. A traditional pin fitting extends across the reverse for secure wear.
The piece is signed Marcus & Co., adding an important maker's distinction to an already substantial antique diamond jewel.
Crescent motifs appeared frequently in antique jewelry and remain particularly appealing to collectors for their graceful form and strong visual symbolism. In this example, the exceptionally generous diamond weight and bold graduated composition give the design considerably more presence than a typical small crescent brooch.
With approximately 9.15 carats of diamonds, this Marcus & Co. jewel can be appreciated both as a sophisticated antique brooch and as a distinctive signed piece of American jewelry history.
Key Features
- Maker: Marcus & Co.
- Period: Antique
- Type: Crescent brooch
- Material: 18K yellow gold
- Diamonds: Approximately 9.15 carats total weight
- Design: Graduated diamond crescent
- Signature: Signed Marcus & Co.
- Closure: Traditional brooch pin fitting
- Style: Antique fine jewelry / signed jewelry
Collector's Note
Signed antique jewelry by important historic makers occupies a distinct place in the collecting market because the maker, craftsmanship, design and gemstones all contribute to the character of the piece. This substantial Marcus & Co. diamond crescent brooch combines a recognizable antique motif with an unusually strong diamond presence and a documented maker's signature.
Explore more Marcus & Co. Jewelry from the DSF Antique Jewelry collection and discover the history of the celebrated American jeweler in our Marcus & Co. editorial.
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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
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• 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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