How much does a 3.00 to 4.99ct H SI1 lab grown heart diamond cost?

As of September 2026, 3.00 to 4.99ct H SI1 lab grown heart diamonds typically cost $1,024 AUD to $51,111 AUD, with a median price of $4,996 AUD. There are currently 19 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct H SI1 Lab Grown Heart

Quick answer

As of September 2026, there are 19 lab grown heart diamonds with H colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $1,024 AUD to $51,111 AUD, with a median of $4,996 AUD. At least 19 retailers stock this exact specification. Half of all listings fall between $509 AUD and $2,061 AUD per carat. The same specification in natural form lists at a median of about $12,124 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. Heart lab grown stones in the index: 440 USD per carat, -9.4% 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

$591 AUD

Highest Price

$78,006 AUD

Average Price

$15,502 AUD

Market Intelligence

Retailers Selling

Price Spread

127.7%

Price Range

Price per carat distribution across retailers

$866/ct

10th Percentile

$262

Median

$866

90th Percentile

$2,242

Score Distribution

19 diamonds scored across 4 quality tiers

Excellent

3 (15.8%)

Very Good

7 (36.8%)

Good

2 (10.5%)

Average

7 (36.8%)

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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