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

As of September 2026, 3.00 to 4.99ct J SI1 lab grown oval diamonds typically cost $9,586 NZD to $58,010 NZD, with a median price of $13,347 NZD. There are currently 95 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct J SI1 Lab Grown Oval

Quick answer

As of September 2026, there are 95 lab grown oval diamonds with J colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $9,586 NZD to $58,010 NZD, with a median of $13,347 NZD. At least 11 retailers stock this exact specification. Half of all listings fall between $3,287 NZD and $4,215 NZD per carat. The same specification in natural form lists at a median of about $15,050 NZD 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. Oval lab grown stones in the index: 487 USD per carat, -11.2% 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

$1,800 NZD

Highest Price

$166,465 NZD

Average Price

$22,325 NZD

Market Intelligence

Retailers Selling

Price Spread

25.9%

Price Range

Price per carat distribution across retailers

$2,152/ct

10th Percentile

$1,829

Median

$2,152

90th Percentile

$7,607

Score Distribution

95 diamonds scored across 4 quality tiers

Excellent

2 (2.1%)

Very Good

32 (33.7%)

Good

48 (50.5%)

Average

13 (13.7%)

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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