How much does a 0.75 to 0.99ct I I1 natural cushion diamond cost?

As of October 2026, 0.75 to 0.99ct I I1 natural cushion diamonds typically cost £484 GBP to £1,150 GBP, with a median price of £708 GBP. There are currently 19 diamonds matching this specification available across retailers.

Where can I find the best price on a I I1 cushion diamond?

About 11% of these diamonds are available at multiple retailers, with an average price spread of 32%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct I I1 Natural Cushion

Quick answer

As of October 2026, there are 19 natural cushion diamonds with I colour and I1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run £484 GBP to £1,150 GBP, with a median of £708 GBP. At least 19 retailers stock this exact specification, and 11% of the stones appear at more than one of them, with an average price spread of 32%. Half of all listings fall between £705 GBP and £966 GBP per carat. Over the last 30 days the median price moved -0.8% and the number of listings moved +2.0%.

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

£410 GBP

Highest Price

£1,452 GBP

Average Price

£752 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

10.8%

Price Spread

32.1%

30-Day Price Trend

-0.8%

30-Day Supply Change

+2.0%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,089/ct

10th Percentile

$852

Median

$1,089

90th Percentile

$1,672

Score Distribution

89 diamonds scored across 3 quality tiers

Very Good

6 (6.7%)

Good

5 (5.6%)

Average

78 (87.6%)

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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