The 1 carat radiant cut is one of the most versatile and brilliantly striking diamond choices available — combining the world's most popular carat weight with the extraordinary fire of a round brilliant in a bold, modern rectangular or square shape. At Variation, explore our certified collection of 1 carat radiant cut lab grown diamonds, IGI certified, conflict-free, and priced up to 80% less than natural diamonds.
About 1 Carat Radiant Cut Lab Grown Diamonds
The 1 carat radiant cut lab grown diamond is one of the most versatile and brilliantly striking diamond combinations available — pairing the world's most popular carat weight with a unique rectangular or square shape that delivers the fire and brilliance of a round brilliant in a bold, geometric form. Created in 1977 by master diamond cutter Henry Grossbard, the radiant cut was the first rectangular diamond to feature a complete brilliant cut facet pattern — delivering a level of sparkle previously only achievable in round diamonds. At Variation, our IGI certified 1 carat radiant cut lab grown diamonds are available in D to F color and VVS1 to VS2 clarity — priced up to 80% less than an equivalent natural diamond.
Why Choose a 1 Carat Radiant Cut Lab Grown Diamond?
The radiant cut is the perfect choice for buyers who want the maximum brilliance of a round cut in a versatile rectangular or square shape. At 1 carat, the radiant cut delivers an extraordinary combination of geometric boldness and exceptional fire that makes it one of the most visually impressive fancy shape diamonds available. Its trimmed corners — a distinctive design feature that reduces chipping risk — add to its bold, modern geometric appeal while making it one of the most practical and durable fancy shape diamonds for everyday wear.
- 70 precisely arranged facets — delivering exceptional brilliance in a rectangular form
- 5.5 x 5.5mm face-up size — bold and commanding at 1 carat
- Trimmed corners — reducing chipping risk while adding geometric elegance
- IGI certified — every stone independently graded and verified
- D, E and F color — the three highest color grades available
- VVS1 to VS2 clarity — all eye-clean, all exceptional quality
- Up to 80% less than an equivalent natural radiant cut diamond
How Big Is a 1 Carat Radiant Cut Lab Grown Diamond?
A 1 carat radiant cut diamond measures approximately 5.5 x 5.5mm face-up in its classic square form — or approximately 6.0 x 5.0mm in a classic rectangular form with a length-to-width ratio of 1.20. The radiant cut's brilliant facet pattern and bold geometric outline create a strong visual presence at 1 carat that is immediately and unmistakably impressive — making it one of the most commanding fancy shape diamonds available at this popular size.
For buyers seeking a larger face-up appearance at 1 carat, a rectangular radiant cut with a length-to-width ratio of 1.25–1.35 faces up considerably larger than a square radiant — delivering more visual presence while retaining the radiant cut's signature brilliant fire and bold geometric appeal.
How to Choose the Best 1 Carat Radiant Cut Lab Grown Diamond
Choose Square or Rectangular
The most important shape decision for a 1 carat radiant cut diamond is whether to choose square or rectangular proportions. A length-to-width ratio of 1.00–1.05 produces the most classic square radiant — bold, symmetrical, and commanding. A ratio of 1.20–1.35 produces a classic rectangular radiant — facing up larger and creating a more elongated, dramatic presence. Both are equally brilliant — the choice is entirely personal preference for shape and visual presence at 1 carat.
Prioritize Symmetry
Symmetry is especially important in a 1 carat radiant cut diamond. Uneven sides or misaligned facets are immediately visible in this geometric shape — and at 1 carat, even minor symmetry issues can significantly detract from the stone's bold visual impact. Always choose Excellent or Very Good symmetry grades for a radiant cut diamond and view the stone face-up in high-resolution video before purchasing to verify perfect geometric balance.
Color Recommendations
Radiant cuts retain color more than round diamonds due to their deep pavilion and rectangular form. For white gold or platinum settings, D–F color grades deliver a pure, colorless appearance that complements the radiant cut's exceptional brilliance. For yellow or rose gold settings — which pair particularly beautifully with the radiant cut's geometric boldness — G–H color grades offer outstanding value with no visible color difference to the naked eye at 1 carat.
Why Buy 1 Carat Radiant Cut Lab Grown Diamonds from Variation?
At Variation, we specialize exclusively in lab grown diamonds — and our 1 carat radiant cut collection reflects our commitment to quality, ethics, and exceptional value.
- IGI certified — every stone comes with a full IGI grading report
- Square and rectangular options available — both radiant cut proportions in stock
- D, E and F color only — the highest color grades available
- VVS1 to VS2 clarity — all eye-clean, all exceptional quality
- Conflict-free & ethically sourced — always
- Priced up to 80% less than equivalent natural diamonds
Explore Other Sizes in Radiant Cut Lab Grown Diamonds
Not sure about 1 carat? Explore our radiant cut lab grown diamonds in other carat weights — all IGI certified, conflict-free, and priced up to 80% less than natural diamonds.
Explore Other Shapes in 1 Carat Lab Grown Diamonds
Not sure about radiant cut? Explore our 1 carat lab grown diamonds in other shapes — each with its own unique character, brilliance, and appeal.
- 1 Carat Round Cut
- 1 Carat Oval Cut
- 1 Carat Cushion Cut
- 1 Carat Emerald Cut
- 1 Carat Princess Cut
- 1 Carat Pear Cut
- 1 Carat Marquise Cut
- 1 Carat Heart Cut
- 1 Carat Portuguese Cut
- 1 Carat Ashoka Cut
- 1 Carat Trillion Cut
- 1 Carat Hexagon Cut
Frequently Asked Questions
How big is a 1 carat radiant cut lab grown diamond?
A 1 carat radiant cut diamond measures approximately 5.5 x 5.5mm face-up in square form or 6.0 x 5.0mm in classic rectangular form. A rectangular radiant with a length-to-width ratio of 1.25–1.35 faces up considerably larger — delivering more visual presence while retaining the radiant cut's signature brilliant fire and bold geometric appeal.
What is the difference between a 1 carat radiant cut and emerald cut lab grown diamond?
Both share a rectangular shape but are very different in character. A radiant cut is a brilliant cut with 70 facets that maximize sparkle and fire — bold, dazzling, and modern. An emerald cut is a step cut with large open facets that emphasize clarity and deliver a dramatic hall of mirrors effect — elegant, sophisticated, and understated. The radiant cut suits buyers who want maximum brilliance in a rectangular shape; the emerald cut suits buyers who value sophistication and depth over sparkle.
Is a 1 carat radiant cut lab grown diamond good for an engagement ring?
Yes — a 1 carat radiant cut engagement ring is a bold, modern, and brilliantly striking choice. Its exceptional brilliance, geometric appeal, and trimmed corners — which make it one of the most durable fancy shape diamonds for everyday wear — make it an outstanding choice for the most important purchase of your life. At up to 80% less than a natural diamond of the same quality, a 1 carat IGI certified lab grown radiant cut offers extraordinary value.
What is the difference between a 1 carat radiant cut and princess cut lab grown diamond?
Both are brilliant cut square diamonds at 1 carat but they differ in one key way. A princess cut has sharp, uncut corners giving it a clean geometric appearance. A radiant cut has trimmed corners giving it a more octagonal outline that protects the stone from chipping. Both deliver exceptional brilliance — the princess cut has a bolder, more modern edge while the radiant cut has a slightly softer, more practical geometric character.
What color grade should I choose for a 1 carat radiant cut lab grown diamond?
Radiant cuts retain color more than round diamonds due to their deep pavilion. For white gold or platinum settings, D–F color is recommended at 1 carat. For yellow or rose gold settings, G–H color delivers a beautiful result at a more accessible price point. All diamonds at Variation are available in D, E and F color grades.
Explore our full collection of 1 carat radiant cut lab grown diamonds above and find the stone that speaks to you. Questions? Our diamond experts are here to help.