How much does a 1.00 to 1.49ct J SI2 natural cushion diamond cost?

As of October 2026, 1.00 to 1.49ct J SI2 natural cushion diamonds typically cost £809 GBP to £2,396 GBP, with a median price of £1,494 GBP. There are currently 283 diamonds matching this specification available across retailers.

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

About 37% of these diamonds are available at multiple retailers, with an average price spread of 65%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct J SI2 Natural Cushion

Quick answer

As of October 2026, there are 283 natural cushion diamonds with J colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £809 GBP to £2,396 GBP, with a median of £1,494 GBP. At least 49 retailers stock this exact specification, and 37% of the stones appear at more than one of them, with an average price spread of 65%. Half of all listings fall between £903 GBP and £1,738 GBP per carat. Over the last 30 days the median price moved +0.4% and the number of listings moved +8.1%.

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

283

Lowest Price

£545 GBP

Highest Price

£5,800 GBP

Average Price

£1,556 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

37.2%

Price Spread

64.7%

30-Day Price Trend

+0.4%

30-Day Supply Change

+8.1%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,719/ct

10th Percentile

$933

Median

$1,719

90th Percentile

$2,929

Score Distribution

715 diamonds scored across 4 quality tiers

Excellent

64 (9.0%)

Very Good

118 (16.5%)

Good

189 (26.4%)

Average

344 (48.1%)

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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