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

As of September 2026, 3.00 to 4.99ct J SI1 lab grown marquise diamonds typically cost $11,659 AUD to $13,169 AUD, with a median price of $12,142 AUD. There are currently 77 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct J SI1 Lab Grown Marquise

Quick answer

As of September 2026, there are 77 lab grown marquise diamonds with J colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $11,659 AUD to $13,169 AUD, with a median of $12,142 AUD. At least 2 retailers stock this exact specification. Half of all listings fall between $3,800 AUD and $3,913 AUD per carat. The same specification in natural form lists at a median of about $13,686 AUD per carat.

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. Marquise lab grown stones in the index: 500 USD per carat, -14.7% 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

$11,538 AUD

Highest Price

$57,748 AUD

Average Price

$13,203 AUD

Market Intelligence

Retailers Selling

Price Spread

2.9%

Price Range

Price per carat distribution across retailers

$2,514/ct

10th Percentile

$2,280

Median

$2,514

90th Percentile

$2,579

Score Distribution

77 diamonds scored across 3 quality tiers

Very Good

11 (14.3%)

Good

54 (70.1%)

Average

12 (15.6%)

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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