How much does a 3.00 to 4.99ct D SI1 natural marquise diamond cost?

As of September 2026, 3.00 to 4.99ct D SI1 natural marquise diamonds typically cost $60,786 AUD to $118,525 AUD, with a median price of $80,726 AUD. There are currently 135 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct D SI1 Natural Marquise

Quick answer

As of September 2026, there are 135 natural marquise diamonds with D colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $60,786 AUD to $118,525 AUD, with a median of $80,726 AUD. At least 50 retailers stock this exact specification. Half of all listings fall between $23,405 AUD and $28,966 AUD per carat. The same specification in lab grown form lists at a median of about $480 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. Marquise natural stones in the index: 2,114 USD per carat, -8.8% 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

135

Lowest Price

$41,263 AUD

Highest Price

$181,670 AUD

Average Price

$86,156 AUD

Market Intelligence

Retailers Selling

Price Spread

21.5%

Price Range

Price per carat distribution across retailers

$18,432/ct

10th Percentile

$15,180

Median

$18,432

90th Percentile

$22,682

Score Distribution

135 diamonds scored across 4 quality tiers

Excellent

9 (6.7%)

Very Good

36 (26.7%)

Good

45 (33.3%)

Average

45 (33.3%)

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Consider Instead

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Lab-Grown D SI1Same specifications, lab-grown origin

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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