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

As of November 2026, 1.00 to 1.49ct H SI2 natural cushion diamonds typically cost £970 GBP to £3,053 GBP, with a median price of £1,851 GBP. There are currently 430 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 59%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct H SI2 Natural Cushion

Quick answer

As of November 2026, there are 430 natural cushion diamonds with H colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £970 GBP to £3,053 GBP, with a median of £1,851 GBP. At least 55 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 59%. Half of all listings fall between £1,163 GBP and £2,128 GBP per carat. Over the last 30 days the median price moved -1.6% and the number of listings moved +8.8%.

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: November 2026

Available

430

Lowest Price

£577 GBP

Highest Price

£5,894 GBP

Average Price

£1,969 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

36.3%

Price Spread

59.1%

30-Day Price Trend

-1.6%

30-Day Supply Change

+8.8%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,189/ct

10th Percentile

$1,213

Median

$2,189

90th Percentile

$3,625

Score Distribution

972 diamonds scored across 4 quality tiers

Excellent

132 (13.6%)

Very Good

163 (16.8%)

Good

286 (29.4%)

Average

391 (40.2%)

Find Your Diamond

Search 430 H 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.

H I1I1 inclusions are not visible without magnification

Save 28%

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