How much does a 5.00ct+ J SI1 natural marquise diamond cost?

As of September 2026, 5.00ct+ J SI1 natural marquise diamonds typically cost HK$369,795 HKD to HK$865,127 HKD, with a median price of HK$516,371 HKD. There are currently 13 diamonds matching this specification available across retailers.

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

Compare prices across retailers on Carat Hunter to see all your options.

5.00ct+ J SI1 Natural Marquise

Quick answer

As of September 2026, there are 13 natural marquise diamonds with J colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run HK$369,795 HKD to HK$865,127 HKD, with a median of HK$516,371 HKD. At least 6 retailers stock this exact specification. Half of all listings fall between HK$76,342 HKD and HK$125,292 HKD 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

Lowest Price

HK$333,381 HKD

Highest Price

HK$1,250,975 HKD

Average Price

HK$596,558 HKD

Market Intelligence

Retailers Selling

Price Spread

48.3%

Price Range

Price per carat distribution across retailers

$12,918/ct

10th Percentile

$8,340

Median

$12,918

90th Percentile

$18,294

Score Distribution

13 diamonds scored across 4 quality tiers

Excellent

1 (7.7%)

Very Good

6 (46.2%)

Good

1 (7.7%)

Average

5 (38.5%)

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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