Gold Signet Ring with a 4.28 ct Diamond – Old European Cut (18-Karat Gold / 750 Fineness)

A masterpiece of jewelry design combining a monumental form with the radiance of a bygone era. This exceptional signet ring, weighing 8.15 g, is a rare find within the luxury bespoke jewelry market. The structure, masterfully sculpted in 18-karat gold / 750 fineness yellow gold, draws immediate attention with its wide band featuring a subtly satin-finished, almost sculptural texture. Positioned at the absolute center within a robust setting crowned by six classic prongs is a monumental natural diamond boasting an impressive weight of 4.28 ct. The stone is distinguished by its unique Old European brilliant-cut, which lends it an unrepeatable depth and a magnetic character. An acquisition of outstanding collectible unique piece status, conceived for those seeking uncompromising and rare vintage earrings and ring alternatives.

Condition: Very good (Exclusive piece accompanied by an art workshop certificate)

Availability: Available immediately at Luxos Arts (Insured shipping)

Central stone: Natural diamond weighing approx. 4.28 ct in an Old European brilliant-cut

Metal: 18-karat gold / 750 fineness yellow gold (hallmarked), the band finished with a bespoke texture

The Old European Cut – The Soul of Historic Craftsmanship and Romantic Allure

The form of this signet ring flawlessly balances classic architectural strength with refined luxury. The wide shoulders of the 18-karat gold band gently taper toward the back, ensuring superb wearing comfort despite its bold presence. The bright, crisp tone of the metal securing the crown provides the perfect framework for the spectacular diamond.

The true heart of this piece is its remarkable Old European brilliant-cut. This cut represents a direct evolutionary step toward the modern brilliant-cut while preserving the signature hallmarks of early hand-craftsmanship – a higher crown, a smaller table, and a characteristically flat culet. Consequently, this stone, which exceeds four and a half carats, does not merely look remarkably grand; when it meets light, it generates broad, deep flashes of fire with a delightfully warm tone. The subtle, natural body color of the diamond perfectly aligns with the aesthetic of antique jewelry with a history, while its medium fluorescence imparts additional depth under varied lighting conditions.

Technical Specifications

• Object Type: Signet ring / Bespoke signet

• Report / Certificate Number: 325/2025 (Kania Art Workshop)

• Setting Material: 18-karat gold / 750 fineness yellow gold (hallmarked)

• Setting Type: Classic prong setting (6 prongs)

• Total Weight of the Piece: 8.15 g

• Central Stone: 1 x Natural Diamond

  • Weight: approx. 4.28 ct

  • Cut: Old European brilliant-cut

  • Dimensions: 9.66 mm x 9.64 mm x 6.66 mm

  • Color: TC (N – O)

  • Clarity: $VS2$ (High clarity grade, inclusions entirely invisible to the naked eye)

  • Fluoresence: Medium

The Luxos Arts Guarantee of Authenticity: High jewelry creations featuring a single diamond with a unit weight exceeding 4 carats are absolute rarities within the European market. The complete specifications and gemmological parameters of this antique ring have been precisely verified and certified in official report no. 325/2025 issued by the Kania Art Workshop. At Luxos Arts, we ensure that every collectible unique piece carries with it absolute historical certainty and complete, professional documentation.