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

As of October 2026, 3.00 to 4.99ct J SI2 natural cushion diamonds typically cost £11,878 GBP to £48,360 GBP, with a median price of £20,590 GBP. There are currently 93 diamonds matching this specification available across retailers.

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

About 43% of these diamonds are available at multiple retailers, with an average price spread of 48%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct J SI2 Natural Cushion

Quick answer

As of October 2026, there are 93 natural cushion diamonds with J colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £11,878 GBP to £48,360 GBP, with a median of £20,590 GBP. At least 43 retailers stock this exact specification, and 43% of the stones appear at more than one of them, with an average price spread of 48%. Half of all listings fall between £3,803 GBP and £6,199 GBP per carat. Over the last 30 days the median price moved +0.8% and the number of listings moved +15.7%.

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. Cushion natural stones in the index: 2,948 USD per carat, +1.7% 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

£7,858 GBP

Highest Price

£84,046 GBP

Average Price

£26,147 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

43.2%

Price Spread

48.0%

30-Day Price Trend

+0.8%

30-Day Supply Change

+15.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$6,683/ct

10th Percentile

$4,145

Median

$6,683

90th Percentile

$9,656

Score Distribution

213 diamonds scored across 4 quality tiers

Excellent

22 (10.3%)

Very Good

56 (26.3%)

Good

42 (19.7%)

Average

93 (43.7%)

Find Your Diamond

Search 93 J SI2 cushion diamonds and compare prices.

Search Diamonds

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