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

As of October 2026, 3.00 to 4.99ct H SI1 lab grown round diamonds typically cost $1,429 NZD to $9,163 NZD, with a median price of $2,811 NZD. There are currently 19 diamonds matching this specification available across retailers.

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

About 19% of these diamonds are available at multiple retailers, with an average price spread of 245%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct H SI1 Lab Grown Round

Quick answer

As of October 2026, there are 19 lab grown round diamonds with H colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $1,429 NZD to $9,163 NZD, with a median of $2,811 NZD. At least 29 retailers stock this exact specification, and 19% of the stones appear at more than one of them, with an average price spread of 245%. Half of all listings fall between $610 NZD and $3,660 NZD per carat. The same specification in natural form lists at a median of about $24,123 NZD per carat. Over the last 30 days the median price moved -44.0% and the number of listings moved -21.8%.

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

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Round lab grown stones in the index: 414 USD per carat, -5.0% month on month. See the full index release

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

Last updated: October 2026

Available

Lowest Price

$659 NZD

Highest Price

$20,906 NZD

Average Price

$4,282 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

18.7%

Price Spread

244.8%

30-Day Price Trend

-44.0%

30-Day Supply Change

-21.8%

Volatility (30d)

0.10

Price Range

Price per carat distribution across retailers

$700/ct

10th Percentile

$153

Median

$700

90th Percentile

$2,687

Score Distribution

103 diamonds scored across 4 quality tiers

Excellent

8 (7.8%)

Very Good

11 (10.7%)

Good

41 (39.8%)

Average

43 (41.7%)

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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