How much does a 3.00 to 4.99ct J SI1 natural cushion diamond cost?

As of September 2026, 3.00 to 4.99ct J SI1 natural cushion diamonds typically cost HK$121,989 HKD to HK$407,762 HKD, with a median price of HK$207,168 HKD. There are currently 213 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct J SI1 Natural Cushion

Quick answer

As of September 2026, there are 213 natural cushion diamonds with J colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run HK$121,989 HKD to HK$407,762 HKD, with a median of HK$207,168 HKD. At least 40 retailers stock this exact specification. Half of all listings fall between HK$42,853 HKD and HK$66,145 HKD per carat. The same specification in lab grown form lists at a median of about HK$15,014 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. Cushion natural stones in the index: 2,792 USD per carat, +1.1% 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

213

Lowest Price

HK$73,454 HKD

Highest Price

HK$958,915 HKD

Average Price

HK$237,853 HKD

Market Intelligence

Retailers Selling

Price Spread

44.0%

Price Range

Price per carat distribution across retailers

$6,884/ct

10th Percentile

$4,400

Median

$6,884

90th Percentile

$9,828

Score Distribution

213 diamonds scored across 4 quality tiers

Excellent

17 (8.0%)

Very Good

39 (18.3%)

Good

74 (34.7%)

Average

83 (39.0%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

Lab-Grown J 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