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Radiant diamonds, lab-grown and natural

A radiant has the emerald cut’s rectangle with a brilliant’s sparkle: lively “crushed ice” in a sturdy shape with cut corners. It is also the shape where millimetres matter more than carats.

Every radiant we sell is certified by GIA, IGI or HRD and has a 360° video, so you can see its sparkle and its outline before you buy. Below: radiants in stock now, their real sizes, how to choose the ratio, and what our gemologist looks for.

See radiant diamonds in stock Compare with other shapes

01 · In stock now

Radiant diamonds you can buy today

Picked from stock by score, 1 to 3 carats, each with a 360° video. Prices in CAD, duties included.

See all 27,444 radiant diamonds, 1–3 ct

02 · Why a radiant

Brilliant sparkle, in a rectangle

The radiant mixes two families: the outline of a step cut and the facets of a brilliant.

  1. Lots of sparkle

    Its brilliant facets give a lively, “crushed ice” sparkle.

  2. Sturdy cut corners

    No sharp points: it suits active hands and simple prong settings.

  3. Hides small inclusions

    Unlike an emerald cut, its many facets mask small inclusions and a little colour.

  4. Square or rectangular

    From a long rectangle to a square, there is a radiant for every taste.

03 · Sizes by carat

Radiant diamond sizes, in millimetres

Typical face-up size, next to a round of the same weight. Real stones vary with how deep they are cut, so always check the measurements on the certificate.

Carat Radiant, length × width Round, diameter
0.5 4.9–5.6 × 3.8–4.4 mm 5.1–5.2 mm See in stock
1 6.2–7.0 × 4.8–5.5 mm 6.4–6.5 mm See in stock
1.5 7.1–8.0 × 5.5–6.3 mm 7.3–7.4 mm See in stock
2 7.8–8.8 × 6.0–6.9 mm 8.1–8.2 mm See in stock
3 8.9–10.1 × 6.9–7.9 mm 9.2–9.4 mm See in stock
4 9.8–11.1 × 7.6–8.7 mm 10.2–10.3 mm See in stock
5 10.6–12.0 × 8.2–9.4 mm 10.9–11.1 mm See in stock
  • 0.5 ct
  • 1 ct
  • 1.5 ct
  • 2 ct
  • 3 ct
  • Round 1 ct

Drawn at actual size on most computer screens at 100% zoom. To compare with any other shape, or see it on your ring size: open the shape comparer.

04 · Length-to-width ratio

Choosing the ratio: taste, not a grade

Rectangular radiants usually fall between 1.15 and 1.50. Around 1.25 to 1.35 is the classic look; longer stones look slimmer. At 1.00 to 1.05 the radiant becomes a square radiant (see below).

GIA gives radiants no overall cut grade, so judge the stone on its video and its millimetres.

  • 1.15 Fuller
  • 1.30 Classic
  • 1.45 Long

05 · Square radiant

The square radiant: sparkle in a square

Cut to a ratio of 1.00 to 1.05, the radiant becomes a square radiant: a princess’s outline without the sharp corners, so it is the easier square to wear every day. Depth matters even more here, so check the millimetres.

A square radiant has a princess’s outline without the sharp corners, so it’s the easier square to wear every day. Check the millimetres: a deep one can face up like a much smaller stone.

See square radiant diamonds in stock →

06 · Depth

Check the millimetres, not just the carats

Many radiants are cut deep to keep weight from the rough. A deep stone carries part of its weight underneath, where you can’t see it, so it faces up smaller than its carats suggest.

Compare the length and width on the certificate with the table above. A 1 ct radiant is usually around 6.2–7.0 × 4.8–5.5 mm; much smaller means a lot of hidden weight. We check this on every radiant before we offer it.

07 · What we look for

How to choose a good radiant

  1. Face-up size

    Compare millimetres, not carats. Avoid stones much smaller than the table for their weight.

  2. Even sparkle

    On video, the sparkle should spread across the whole stone, with no dark patches.

  3. A ratio you like

    1.15 to 1.50 for a rectangle; 1.00 to 1.05 for a square.

  4. Colour in the corners

    Radiants can hold colour in their corners. G–H looks white face-up; go higher in platinum if you are sensitive to warmth.

  5. Eye-clean

    SI1–VS2 is usually eye-clean in a radiant. Check the video.

  6. Simple prongs

    Four corner prongs hold it well; its cut corners need no extra protection.

Natural or lab-grown? The advice is the same: a radiant looks the same whatever its origin. Only the price differs, so compare live prices in Canadian dollars with the switch above the stones.

Our advice

“A radiant is the emerald’s outline with a brilliant’s sparkle, and its cut corners make it sturdy. Many are cut deep to keep weight, so we check the millimetres before the carats.”

Jouwell, Montreal

08 · Questions

Radiant diamond questions

What is a radiant-cut diamond?

A rectangle or square with cut corners, faceted like a brilliant. It has the outline of an emerald cut with far more sparkle.

Radiant or emerald cut?

Same outline, different light. The radiant sparkles; the emerald cut flashes in calm steps and shows more of the inside, so it needs a higher clarity.

Why does a radiant look smaller than its carat weight?

It is probably cut deep, with weight hidden underneath. Compare its length and width with the size table.

What is the best ratio for a radiant?

Taste decides. 1.25 to 1.35 is the classic rectangle; 1.00 to 1.05 is a square radiant.

Is a radiant cheaper than a round?

Often, for natural diamonds, because less rough is lost in cutting. For lab-grown diamonds it changes with size. Compare live prices at the size you want.

What setting suits a radiant?

Four corner prongs, a bezel or a halo. Its cut corners need no special protection.