Radiant Cut Lab Grown Diamonds
Beveled corners and brilliant faceting — the clean lines of an emerald with the sparkle of a round.
What is a radiant cut diamond?
The radiant is a square-to-rectangular cut with beveled (cropped) corners and brilliant-style faceting — roughly 70 facets that throw plenty of fire. Created by Henry Grossbard in 1977, it was designed to combine the clean silhouette of an emerald cut with the sparkle of a round brilliant. The result is a brilliant, lively stone with crisp, modern lines.
Square or elongated
Radiants come in two looks: a near-square radiant (ratio around 1.00–1.05) and an elongated radiant (1.20 and up) that lengthens the finger. Both sparkle the same way — pick the silhouette you prefer.
What to look for in a radiant
- Ratio — decide between square and elongated.
- Clarity — the busy brilliant faceting hides small inclusions well, so eye-clean SI stones often perform beautifully and save you money.
- Even sparkle — look for a lively face with no large dark zones.
Use the filters above to set carat, colour, and clarity.
Radiant engagement rings
The cropped corners make a radiant durable and easy to set — it suits halos, hidden halos, three-stone, and solitaire designs. Choose your loose stone here, then build it into the ring of your choice.
Ready for a setting? Explore our Radiant engagement rings.
Why buy a radiant from Stienhardt
Every Stienhardt radiant is independently certified by IGI or GIA, graded for the full 4Cs, and conflict-free — all backed by free 30-day returns.
Radiant Cut Lab Grown Diamonds — frequently asked questions
What is a radiant cut diamond?
A square-to-rectangular cut with beveled corners and brilliant faceting (about 70 facets), combining an emerald's clean lines with a round's sparkle. It was created by Henry Grossbard in 1977.
What's the difference between a radiant and an emerald cut?
Both have cropped corners and a rectangular option, but the radiant uses brilliant faceting for sparkle, while the emerald is a step cut with mirror-like flashes.
Does a radiant hide inclusions well?
Yes — its busy brilliant faceting masks small inclusions, so eye-clean SI stones often look excellent and cost less.
Should I choose a square or elongated radiant?
Square radiants sit around 1.00–1.05; elongated radiants are 1.20 and up and lengthen the finger. Both sparkle the same — it's down to taste.
Are radiant cut lab grown diamonds real diamonds?
Yes — they're real diamonds, chemically and optically identical to mined stones, and recognized as diamonds by the FTC.
Are radiant cut lab grown diamonds certified?
Yes. Every Stienhardt radiant is independently certified by IGI or GIA and graded for the full 4Cs.
Is a radiant cut durable?
Yes — the beveled corners have no sharp points to chip, making it one of the more durable and easy-to-set shapes.
What setting suits a radiant?
Halos, hidden halos, three-stone, and solitaire settings all complement a radiant's crisp shape.
Can I set a radiant into an engagement ring?
Absolutely. Choose your loose stone, then pick a setting and we'll mount it for you.
What is your return policy?
Free 30-day returns on diamonds and jewelry.