.25 Art Deco Diamond & Onyx Cocktail Ring Platinum

This Art Deco cocktail ring features a rectangle-shaped black onyx measuring 19.10 x 11.48mm set in platinum. A .25 carat old European cut diamond sits in one corner, creating a striking contrast against the dark onyx. The J color diamond shows a warm near-colorless tone, while the SI1 clarity means any inclusions are barely visible to the naked eye.

An engraved border frames the geometric design, with decorative shoulders adding dimension to the platinum band. The old European cut gives the diamond a soft, romantic sparkle with its larger facets and smaller table. The rectangular onyx provides a bold canvas for the corner-set diamond, creating an asymmetrical look that's distinctly Art Deco.