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

As of September 2026, 3.00 to 4.99ct J SI2 lab grown round diamonds typically cost $3,394 AUD to $76,083 AUD, with a median price of $38,411 AUD. There are currently 78 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct J SI2 Lab Grown Round

Quick answer

As of September 2026, there are 78 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 $3,394 AUD to $76,083 AUD, with a median of $38,411 AUD. At least 8 retailers stock this exact specification. Half of all listings fall between $1,132 AUD and $4,084 AUD per carat. The same specification in natural form lists at a median of about $12,023 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. Round lab grown stones in the index: 438 USD per carat, -14.1% 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

$2,104 AUD

Highest Price

$103,014 AUD

Average Price

$37,174 AUD

Market Intelligence

Retailers Selling

Price Spread

111.2%

Price Range

Price per carat distribution across retailers

$1,893/ct

10th Percentile

$756

Median

$1,893

90th Percentile

$4,874

Score Distribution

78 diamonds scored across 4 quality tiers

Excellent

10 (12.8%)

Very Good

21 (26.9%)

Good

17 (21.8%)

Average

30 (38.5%)

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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