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

As of October 2026, 3.00 to 4.99ct J SI1 lab grown round diamonds typically cost $1,273 NZD to $11,172 NZD, with a median price of $4,994 NZD. There are currently 54 diamonds matching this specification available across retailers.

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

About 46% of these diamonds are available at multiple retailers, with an average price spread of 53%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct J SI1 Lab Grown Round

Quick answer

As of October 2026, there are 54 lab grown round diamonds with J colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $1,273 NZD to $11,172 NZD, with a median of $4,994 NZD. At least 23 retailers stock this exact specification, and 46% of the stones appear at more than one of them, with an average price spread of 53%. Half of all listings fall between $2,088 NZD and $3,954 NZD per carat. The same specification in natural form lists at a median of about $17,002 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

$1,161 NZD

Highest Price

$126,939 NZD

Average Price

$8,900 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

46.1%

Price Spread

52.8%

30-Day Price Trend

-0.2%

30-Day Supply Change

-4.6%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,984/ct

10th Percentile

$362

Median

$1,984

90th Percentile

$3,170

Score Distribution

100 diamonds scored across 4 quality tiers

Excellent

47 (47.0%)

Very Good

11 (11.0%)

Good

39 (39.0%)

Average

3 (3.0%)

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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