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Independently certified, most by IGI · Laser inscribed
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3 Carat Lab Grown Diamonds

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Buying guide

Choosing 3 carat lab grown diamonds.

A 3 carat round is about 9.3 mm across, a size that is rarely affordable in a mined stone. Big stones show everything, so look at the video rather than the grade alone: you want even brightness across the stone and no dark areas under the table.

Three carats is the most-searched size in lab grown diamonds, and for good reason: it's a true statement stone at a price that would buy a modest mined one.

3 Carat lab grown diamonds at a glance

  • 1,024 colorless stones in stock between 3.00–3.99 ct, mostly round, cushion, oval and princess
  • Listed prices from $730, median $1,425 (about $427 per carat)
  • Round face-up size: 9.2–9.4 mm
  • Most stones IGI certified, laser-inscribed, with real photos and 360° video

How to choose a 3 carat lab diamond

At this size, cut quality decides whether a stone looks lively or glassy. Stick to Ideal or Excellent cut, check the IGI report for polish and symmetry, and watch the 360° video. Every stone here has one.

Some stones are priced on request. Ask about any of them and our graders in Surat reply personally.

How much is a 3 carat lab grown diamond?

Priced 3 carat stones at Culture Carats start at $730, with a median of about $1,425. A 3.00–3.19 ct D–F, VS stone is around $1,190; VVS and IF are around $1,700.

Compare sizes on the true-scale carat guide, check prices with the price-per-carat chart, or set your stone in a custom ring made in Surat.

Prices are listed prices in USD for colorless stones, October 2026. They change daily with inventory.

Questions

Questions about 3 carat lab grown diamonds.

How big is a 3 carat lab grown diamond?

A 3 carat round brilliant is about 9.2 to 9.4 mm across.

What matters most in a 3 carat diamond?

Cut. Large stones show everything, so choose Excellent or Ideal cut and check the 360° video for even brightness with no dark areas under the table.

Are 3 carat lab diamonds certified?

Most carry an independent grading report, usually from IGI, with the report number laser-inscribed on the girdle so you can match stone to report.

Is a 3 carat lab grown diamond a real diamond?

Yes. It is carbon in the same crystal structure as a mined diamond, with the same hardness and sparkle. Only its origin differs.