How much does a 3.00 to 4.99ct J SI2 natural marquise diamond cost?

As of November 2026, 3.00 to 4.99ct J SI2 natural marquise diamonds typically cost $19,748 AUD to $64,041 AUD, with a median price of $36,806 AUD. There are currently 39 diamonds matching this specification available across retailers.

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

About 43% of these diamonds are available at multiple retailers, with an average price spread of 56%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct J SI2 Natural Marquise

Quick answer

As of November 2026, there are 39 natural marquise diamonds with J colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $19,748 AUD to $64,041 AUD, with a median of $36,806 AUD. At least 23 retailers stock this exact specification, and 43% of the stones appear at more than one of them, with an average price spread of 56%. Half of all listings fall between $6,590 AUD and $11,394 AUD per carat. Over the last 30 days the median price moved +4.6% and the number of listings moved +8.5%.

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. Marquise natural stones in the index: 2,268 USD per carat, +10.8% 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: November 2026

Available

Lowest Price

$12,549 AUD

Highest Price

$116,184 AUD

Average Price

$40,047 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

43.3%

Price Spread

56.5%

30-Day Price Trend

+4.6%

30-Day Supply Change

+8.5%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$5,979/ct

10th Percentile

$3,631

Median

$5,979

90th Percentile

$8,557

Score Distribution

91 diamonds scored across 4 quality tiers

Excellent

17 (18.7%)

Very Good

38 (41.8%)

Good

16 (17.6%)

Average

20 (22.0%)

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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