How much does a 5.00ct+ H SI1 lab grown radiant diamond cost?

As of September 2026, 5.00ct+ H SI1 lab grown radiant diamonds typically cost $1,687 AUD to $15,184 AUD, with a median price of $3,303 AUD. There are currently 27 diamonds matching this specification available across retailers.

Where can I find the best price on a H SI1 radiant diamond?

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

5.00ct+ H SI1 Lab Grown Radiant

Quick answer

As of September 2026, there are 27 lab grown radiant diamonds with H colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $1,687 AUD to $15,184 AUD, with a median of $3,303 AUD. At least 8 retailers stock this exact specification. Half of all listings fall between $255 AUD and $881 AUD per carat. The same specification in natural form lists at a median of about $21,747 AUD per carat.

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

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

$1,422 AUD

Highest Price

$201,690 AUD

Average Price

$14,238 AUD

Market Intelligence

Retailers Selling

Price Spread

200.3%

Price Range

Price per carat distribution across retailers

$224/ct

10th Percentile

$176

Median

$224

90th Percentile

$729

Score Distribution

27 diamonds scored across 4 quality tiers

Excellent

5 (18.5%)

Very Good

11 (40.7%)

Good

7 (25.9%)

Average

4 (14.8%)

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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