Antique Old Mine Diamond Ruby Sapphire 18K Yellow Gold Cufflinks
Old Mine Diamonds with Ruby and Sapphire Accents
These striking antique cufflinks are crafted in 18K gold and designed with four softly domed circular faces. Each cufflink pairs a ruby-accented terminal with a sapphire-accented terminal, creating a sophisticated contrast of rich red and deep blue against the warmth of yellow gold.
The four terminals are set with eight old mine-cut diamonds weighing approximately 2.00 carats in total. Their broad facets and individual proportions reflect the distinctive character of diamonds cut by hand. Two diamonds adorn each circular face, positioned on opposite sides of a vertical row of square-cut rubies or sapphires.
Fine beaded borders frame the gemstone rows, while delicate engraved flourishes appear at either end. The softly textured gold surfaces allow the gemstones to remain the focus of the composition. The double-sided construction ensures that the jeweled design is visible from both sides of the cuff.
The connectors are stamped “BREVETÉ S.G.D.G.”, a historic French patent designation associated with the cufflinks’ patented joining mechanism. Because this mark does not independently confirm the manufacture of the entire pair in France, the cufflinks are described as bearing a French patent mark rather than being definitively attributed to French manufacture.
Key Features
• Authentic antique double-sided cufflinks
• Crafted in 18K gold
• Set with eight old mine-cut diamonds
• Approximately 2.00 carats total diamond weight
• Square-cut ruby and sapphire accents
• One ruby terminal and one sapphire terminal on each cufflink
• Four softly domed circular faces
• Each circular face measures 16 mm (approximately 0.63 inches) in diameter
• Fine beaded borders and engraved decorative details
• Connectors stamped “BREVETÉ S.G.D.G.”
• Excellent antique condition
Specifications
• Period: Antique
• Metal: 18K Gold
• Diamonds: Eight old mine-cut diamonds
• Total Diamond Weight: Approximately 2.00 carats
• Colored Gemstones: Square-cut rubies and sapphires
• Design: Domed circular jeweled terminals
• Construction: Double-sided cufflinks
• Diameter: 16 mm / approximately 0.63 inches per circular face
• Connector Mark: BREVETÉ S.G.D.G.
• Condition: Excellent antique condition
Collector’s Note
This pair brings together several qualities valued in antique men’s jewelry: individually cut old mine diamonds, contrasting ruby and sapphire details, fully decorated double-sided terminals and an inventive patent-marked mechanism. The subtle variations in the old mine cuts are characteristic of historic hand-cut diamonds, giving each stone its own distinctive light and personality. The balanced red-and-blue composition makes these cufflinks particularly appealing to collectors of antique gemstone jewelry and refined men’s accessories.
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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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