How much does a 2.00 to 2.99ct I SI2 lab grown cushion diamond cost?

As of October 2026, 2.00 to 2.99ct I SI2 lab grown cushion diamonds typically cost £784 GBP to £2,905 GBP, with a median price of £1,840 GBP. There are currently 24 diamonds matching this specification available across retailers.

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

About 53% of these diamonds are available at multiple retailers, with an average price spread of 42%. A comparison tool like Carat Hunter lets you see all the prices side by side.

2.00 to 2.99ct I SI2 Lab Grown Cushion

Quick answer

As of October 2026, there are 24 lab grown cushion diamonds with I colour and SI2 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run £784 GBP to £2,905 GBP, with a median of £1,840 GBP. At least 12 retailers stock this exact specification, and 53% of the stones appear at more than one of them, with an average price spread of 42%. Half of all listings fall between £958 GBP and £1,549 GBP per carat. The same specification in natural form lists at a median of about £4,565 GBP per carat. Over the last 30 days the median price moved -0.0% and the number of listings moved -1.9%.

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 lab grown stones in the index: 516 USD per carat, +6.9% 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

£560 GBP

Highest Price

£7,175 GBP

Average Price

£1,930 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

52.8%

Price Spread

41.6%

30-Day Price Trend

-0.0%

30-Day Supply Change

-1.9%

Volatility (30d)

0.03

Price Range

Price per carat distribution across retailers

$1,903/ct

10th Percentile

$525

Median

$1,903

90th Percentile

$3,625

Score Distribution

46 diamonds scored across 4 quality tiers

Excellent

20 (43.5%)

Very Good

2 (4.3%)

Good

21 (45.7%)

Average

3 (6.5%)

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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