How much does a 3.00 to 4.99ct G I1 natural cushion diamond cost?

As of September 2026, 3.00 to 4.99ct G I1 natural cushion diamonds typically cost £11,099 GBP to £65,828 GBP, with a median price of £22,516 GBP. There are currently 9 diamonds matching this specification available across retailers.

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

About 47% 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.

3.00 to 4.99ct G I1 Natural Cushion

Quick answer

As of September 2026, there are 9 natural cushion diamonds with G colour and I1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £11,099 GBP to £65,828 GBP, with a median of £22,516 GBP. At least 17 retailers stock this exact specification, and 47% of the stones appear at more than one of them, with an average price spread of 59%. Half of all listings fall between £4,411 GBP and £7,548 GBP per carat. Over the last 30 days the median price moved -34.9% and the number of listings moved -76.7%.

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

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Cushion natural stones in the index: 2,792 USD per carat, +1.1% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

Lowest Price

£9,541 GBP

Highest Price

£84,106 GBP

Average Price

£30,368 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

46.7%

Price Spread

58.9%

30-Day Price Trend

-34.9%

30-Day Supply Change

-76.7%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$7,128/ct

10th Percentile

$4,881

Median

$7,128

90th Percentile

$14,431

Score Distribution

9 diamonds scored across 3 quality tiers

Very Good

3 (33.3%)

Good

4 (44.4%)

Average

2 (22.2%)

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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