How much does a 3.00 to 4.99ct J SI2 lab grown round diamond cost?

As of October 2026, 3.00 to 4.99ct J SI2 lab grown round diamonds typically cost $2,884 NZD to $57,638 NZD, with a median price of $4,469 NZD. There are currently 15 diamonds matching this specification available across retailers.

Where can I find the best price on a J SI2 round diamond?

About 60% of these diamonds are available at multiple retailers, with an average price spread of 61%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct J SI2 Lab Grown Round

Quick answer

As of October 2026, there are 15 lab grown round diamonds with J colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $2,884 NZD to $57,638 NZD, with a median of $4,469 NZD. At least 11 retailers stock this exact specification, and 60% of the stones appear at more than one of them, with an average price spread of 61%. Half of all listings fall between $3,366 NZD and $6,552 NZD per carat. The same specification in natural form lists at a median of about $15,427 NZD per carat. Over the last 30 days the median price moved -0.2% and the number of listings moved -4.6%.

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

$2,671 NZD

Highest Price

$104,318 NZD

Average Price

$17,457 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

60.0%

Price Spread

61.3%

30-Day Price Trend

-0.2%

30-Day Supply Change

-4.6%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,921/ct

10th Percentile

$1,630

Median

$2,921

90th Percentile

$4,307

Score Distribution

24 diamonds scored across 3 quality tiers

Excellent

10 (41.7%)

Very Good

4 (16.7%)

Good

10 (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