Cognac Diamond Solitaire Engagement Ring in 14K Brown Gold

The only cognac diamond solitaire engagement ring set in 14K brown gold — our signature alloy, the only metal in the world developed specifically for cognac diamonds. A .40ct natural cognac diamond sits in a four-prong solitaire above a clean 1.5mm plain band, with no pavé to compete for attention — just stone, metal, and finger. Handcrafted in Queens, NYC.

The stone

The center stone is a natural cognac diamond, graded between C4 and C6 on the Argyle color scale — the deep amber-orange range where cognac diamonds show their characteristic internal fire. Cognac diamonds are formed by nitrogen and natural radiation deep in the earth over billions of years; the color is permanent, untreated, and entirely natural. No two stones are alike, and the .40ct round brilliant we set in this ring is chosen by hand for clarity, cut quality, and saturation.

The setting

A classic four-prong solitaire raises the cognac diamond off the finger on a smooth, unadorned 1.5mm plain band — the purest expression of a solitaire engagement ring. No pavé, no side stones, no distractions. The band is the slimmest we offer, designed to disappear against the finger so the stone reads larger and the line of the ring stays delicate. Stacks effortlessly with any wedding band.

The metal

This ring is offered in five metals: our signature 14K brown gold, 14K yellow gold, 14K rose gold, 14K white gold, and platinum. 14K brown gold is the Brownstone Collection's defining alloy — an earthy amber-brown that sits between yellow and rose gold. It's the only metal in the world developed specifically for cognac diamonds, designed so the stone and metal merge into one continuous warm tone instead of contrasting. All gold options are solid 14K throughout, nickel-free, and never plated or gold-filled.

Handcrafted in New York City

Every Brownstone piece is made to order by founder Dimitri in our Queens, NYC workshop. Production runs 2–3 weeks from order confirmation. All orders ship free and fully insured, backed by a lifetime warranty against manufacturing defects. Non-customized pieces are returnable within 14 days. Questions before you order? Call 929-806-1502 or email [email protected].