Radiant Lab-Grown Diamond 5×4 mm, Loose

A radiant-cut lab-grown diamond, 5 x 4 mm, D to F color, VVS clarity, sold individually. A rectangle with cut corners and brilliant faceting, larger than the 4.2 x 3.15 version.

Closer to square than the small version

The 4.2 x 3.15 version is clearly elongated, obviously a rectangle. The 5 x 4 has a ratio of just 1.25, nearly square. Same shape name, very different feel: one is slim, the other is square and full.

Choose by the piece: a slim stone suits a row along a ring band or side stones; a near-square stone suits the center of a piece, because it's balanced and doesn't pull the eye in any direction.

As a main stone, radiant has its own advantage

At 5 x 4 mm, the stone is large enough to stand alone. A radiant is brilliant cut, so it keeps nearly as much sparkle as a round while still giving geometric lines — it's the shape for people who want both.

Compared with a princess of similar size, a radiant is much more durable because its four corners are already cut rather than pointed. If you like an angular shape but wear it every day, radiant is the safer choice.

Ordering and setting

Listed in two dimensions in millimetres, not converted to ly. With a near-square ratio, orientation matters less than for the slim version, but our setter still aligns the edges parallel to the piece.

The seat is cut to match the radiant's corner cuts exactly. A seat made for an emerald or princess of the same measurements can't be reused, because the three shapes have different corners.

Care

Many small facets pick up oil faster than a step cut. Wipe with a soft cloth after each wear, and wash with warm water and a soft brush every week.

Cut corners are sturdier than sharp ones, but they're still the first spot to take an impact. Take it off for heavy work.