How much does a 5.00ct+ D SI2 lab grown radiant diamond cost?

As of September 2026, 5.00ct+ D SI2 lab grown radiant diamonds typically cost $9,306 USD to $75,337 USD, with a median price of $42,322 USD. There are currently 2 diamonds matching this specification available across retailers.

Where can I find the best price on a D SI2 radiant diamond?

Compare prices across retailers on Carat Hunter to see all your options.

5.00ct+ D SI2 Lab Grown Radiant

Quick answer

As of September 2026, there are 2 lab grown radiant diamonds with D color and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $9,306 USD to $75,337 USD, with a median of $42,322 USD. At least 13 retailers stock this exact specification. Half of all listings fall between $260 USD and $802 USD per carat. The same specification in natural form lists at a median of about $16,668 USD per carat.

Three of the best scored stones at this specification right now:

5.50ct Radiant D SI2, IGI, score 76 of 100, from $1,052 USD

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Radiant lab grown stones in the index: 473 USD per carat, -12.5% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

Lowest Price

$1,052 USD

Highest Price

$83,591 USD

Average Price

$42,322 USD

Market Intelligence

Retailers Selling

Price Spread

170.9%

Price Range

Price per carat distribution across retailers

$317/ct

10th Percentile

$191

Median

$317

90th Percentile

$1,228

Score Distribution

2 diamonds scored across 2 quality tiers

Very Good

1 (50.0%)

Good

1 (50.0%)

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Related Specifications

D IF D VVS1 D VVS2 D VS1 D VS2 D SI1 E IF E VVS1 E VVS2 E VS1 E VS2 E SI1 F IF F VVS1 F VVS2 F VS1 F VS2 F SI1 G IF G VVS1 G VVS2 G VS1 G VS2 G SI1 H IF H VVS1 H VVS2 H VS1 H VS2 H SI1 I IF I VVS1 I VVS2 I VS1 I VS2 I SI1