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

As of September 2026, 3.00 to 4.99ct J SI2 natural cushion diamonds typically cost $22,884 AUD to $68,910 AUD, with a median price of $37,051 AUD. There are currently 196 diamonds matching this specification available across retailers.

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

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

3.00 to 4.99ct J SI2 Natural Cushion

Quick answer

As of September 2026, there are 196 natural cushion diamonds with J colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $22,884 AUD to $68,910 AUD, with a median of $37,051 AUD. At least 38 retailers stock this exact specification. Half of all listings fall between $7,181 AUD and $11,796 AUD per carat. The same specification in lab grown form lists at a median of about $7,705 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. 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

196

Lowest Price

$14,928 AUD

Highest Price

$174,946 AUD

Average Price

$42,783 AUD

Market Intelligence

Retailers Selling

Price Spread

47.1%

Price Range

Price per carat distribution across retailers

$6,977/ct

10th Percentile

$4,106

Median

$6,977

90th Percentile

$9,750

Score Distribution

196 diamonds scored across 4 quality tiers

Excellent

18 (9.2%)

Very Good

44 (22.4%)

Good

62 (31.6%)

Average

72 (36.7%)

Find Your Diamond

Search 196 J SI2 cushion diamonds and compare prices.

Search Diamonds

Consider Instead

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

Lab-Grown J SI2Same specifications, lab-grown origin

Save 57%

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