How much does a 5.00ct+ J SI2 natural marquise diamond cost?

As of October 2026, 5.00ct+ J SI2 natural marquise diamonds typically cost $51,359 AUD to $129,651 AUD, with a median price of $91,217 AUD. There are currently 8 diamonds matching this specification available across retailers.

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

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5.00ct+ J SI2 Natural Marquise

Quick answer

As of October 2026, there are 8 natural marquise diamonds with J colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $51,359 AUD to $129,651 AUD, with a median of $91,217 AUD.

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: October 2026

Available

Lowest Price

$40,628 AUD

Highest Price

$152,851 AUD

Average Price

$92,749 AUD

Score Distribution

20 diamonds scored across 4 quality tiers

Excellent

1 (5.0%)

Very Good

5 (25.0%)

Good

7 (35.0%)

Average

7 (35.0%)

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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