Antique Edwardian 18K & Platinum Interlocking Old Mine Diamond Geometric Brooch

An original antique Edwardian diamond brooch, beautifully crafted with a platinum-topped setting over 18 karat yellow gold, showcasing the fine craftsmanship and geometric elegance of the early 20th century. The openwork design features interlocking diamond-set squares, accented by five larger bezel-set old mine cut diamonds, including a central diamond suspended within the design. The brooch is set with approximately 3.50 carats total weight of original old mine cut diamonds, ranging from H–J in color and VS2–SI1 in clarity, with the largest central diamond weighing approximately 0.50 carat. The contrast between the platinum diamond-set face and the richly finished yellow gold reverse is characteristic of fine Edwardian jewelry. Beautifully constructed and remarkably detailed, this is a sophisticated example of antique diamond jewelry with enduring appeal.

Specifications:

Period: Edwardian, circa 1900–1915

Metal: Platinum top over 18K yellow gold

Diamonds: Approximately 3.50 carats total weight, original old mine cuts

Color: H–J

Clarity: VS2–SI1

Center Diamond: Approximately 0.50 carat, old mine cut

Measurements: 1.25 inches in diameter

Weight: 8.1 grams

Hallmarks: Serial numbered; maker unknown

Closure: Traditional pin stem and clasp

Condition: Antique estate condition

B - FCRTE2