4.05 ct Round Brilliant Lab Grown Diamond (Colour I, Clarity VS1, IGI Certified)

Four Carats of Round Brilliant Brilliance. Certified.

The round brilliant is the world's most popular diamond shape — and for good reason. Its 58 precisely engineered facets deliver more light return, more fire, and more scintillation than any other diamond cut. At 4.05 carats of I color and VS1 clarity, independently certified by the International Gemological Institute, this stone delivers the full, breathtaking presence of a four-carat round brilliant at a price that reflects genuine value. This is the center stone for the engagement ring that most people only dream about.

The Specifications

• Carat Weight: 4.05 Carats
• Shape: Round Brilliant — 58 facets engineered for maximum light return, fire, and scintillation; the world's most popular and most brilliant diamond shape
• Color: I — Near-colorless; see our transparent note below for what I color means specifically in a round brilliant at this carat weight
• Clarity: VS1 — Very Slightly Included, first degree; inclusions invisible to the naked eye and extremely difficult to detect even under 10x magnification — exceptional transparency and brilliance
• Certification: IGI Certified — International Gemological Institute; independent third-party verification of color, clarity, cut, and carat weight
• Origin: Lab-Grown — Physically, chemically, and optically identical to a mined diamond; conflict-free and ethically sourced

A Transparent Note on Color

I Color in a Round Brilliant: The round brilliant's exceptional faceting pattern is the most effective of any diamond shape at masking color — far more so than step-cut shapes like the emerald or Asscher. I color in a round brilliant appears white and brilliant to the naked eye in virtually all settings and lighting conditions. In yellow gold, any warmth is completely invisible and beautifully complemented by the metal. In white gold or platinum, I color in a round brilliant remains an excellent choice for buyers who prioritize carat weight and clarity over color grade. The VS1 clarity on this stone is a genuine strength — completely eye-clean and exceptional for a diamond of this size.

Why VS1 Clarity Matters at Four Carats

At 4 carats, a diamond's larger table means inclusions can be more visible than in smaller stones of the same clarity grade. VS1 clarity ensures this stone is completely eye-clean — inclusions invisible to the naked eye and extremely difficult to find even under magnification. For a four-carat round brilliant, VS1 is the right clarity choice to ensure the stone performs at its absolute best in every light and every setting.

The Round Brilliant at Four Carats

There is a reason the round brilliant has been the world's most popular diamond shape for over a century — no other cut delivers its combination of fire, brilliance, and scintillation. At 4.05 carats, those qualities are amplified into something extraordinary: a stone that catches light from across the room, that creates a display of fire and brilliance that is immediately and unmistakably beautiful, and that works in every setting, every metal, and every style. Four carats of round brilliant is a milestone. This stone clears it with room to spare.

IGI Certified: Complete Confidence

This diamond is certified by the International Gemological Institute (IGI), providing independent, third-party verification of every quality characteristic. The IGI certificate travels with the stone and provides permanent documentation of its specifications. We encourage all buyers to review the certificate carefully and contact us with any questions before purchase.

Setting Recommendations

A 4.05 carat round brilliant is one of the most versatile center stones in fine jewelry — it works beautifully in virtually any setting style. A solitaire or cathedral setting elevates the stone and allows maximum light entry. A hidden halo adds surrounding brilliance without competing with the center stone. A pavé band adds continuous sparkle along the shank. All metal tones work beautifully with a round brilliant — white gold and platinum for a cool, modern look; yellow gold for warmth and vintage character. Contact us to discuss custom setting options.

Perfect For

• A custom engagement ring center stone with the world's most popular and brilliant diamond shape
• A buyer who wants four carats of certified round brilliant quality at an accessible price
• Anyone who values IGI certification and complete transparency about their diamond's quality

A 4.05 carat IGI certified round brilliant at I/VS1 is an exceptional value. Contact us with any questions or to discuss custom setting options.