How much does a 1.00 to 1.49ct G I1 natural cushion diamond cost?

As of November 2026, 1.00 to 1.49ct G I1 natural cushion diamonds typically cost £837 GBP to £3,099 GBP, with a median price of £1,706 GBP. There are currently 52 diamonds matching this specification available across retailers.

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

About 18% of these diamonds are available at multiple retailers, with an average price spread of 46%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct G I1 Natural Cushion

Quick answer

As of November 2026, there are 52 natural cushion diamonds with G colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £837 GBP to £3,099 GBP, with a median of £1,706 GBP. At least 20 retailers stock this exact specification, and 18% of the stones appear at more than one of them, with an average price spread of 46%. Half of all listings fall between £1,078 GBP and £1,736 GBP per carat. Over the last 30 days the median price moved -4.2% and the number of listings moved +11.4%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Cushion natural stones in the index: 2,881 USD per carat, -2.5% 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

Lowest Price

£613 GBP

Highest Price

£3,447 GBP

Average Price

£1,914 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

17.6%

Price Spread

46.5%

30-Day Price Trend

-4.2%

30-Day Supply Change

+11.4%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$1,901/ct

10th Percentile

$1,080

Median

$1,901

90th Percentile

$2,882

Score Distribution

175 diamonds scored across 4 quality tiers

Excellent

3 (1.7%)

Very Good

29 (16.6%)

Good

36 (20.6%)

Average

107 (61.1%)

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Consider Instead

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

H I1H colour is visually identical to G to the naked eye

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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