How much does a 2.00 to 2.99ct D SI1 lab grown cushion diamond cost?

As of October 2026, 2.00 to 2.99ct D SI1 lab grown cushion diamonds typically cost £309 GBP to £2,602 GBP, with a median price of £736 GBP. There are currently 95 diamonds matching this specification available across retailers.

Where can I find the best price on a D SI1 cushion diamond?

About 25% of these diamonds are available at multiple retailers, with an average price spread of 95%. A comparison tool like Carat Hunter lets you see all the prices side by side.

2.00 to 2.99ct D SI1 Lab Grown Cushion

Quick answer

As of October 2026, there are 95 lab grown cushion diamonds with D colour and SI1 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run £309 GBP to £2,602 GBP, with a median of £736 GBP. At least 37 retailers stock this exact specification, and 25% of the stones appear at more than one of them, with an average price spread of 95%. Half of all listings fall between £216 GBP and £518 GBP per carat. The same specification in natural form lists at a median of about £6,982 GBP per carat. Over the last 30 days the median price moved +8.5% and the number of listings moved +5.0%.

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 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

£202 GBP

Highest Price

£3,351 GBP

Average Price

£1,105 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

25.4%

Price Spread

95.0%

30-Day Price Trend

+8.5%

30-Day Supply Change

+5.0%

Volatility (30d)

0.06

Price Range

Price per carat distribution across retailers

$425/ct

10th Percentile

$220

Median

$425

90th Percentile

$1,093

Score Distribution

198 diamonds scored across 4 quality tiers

Excellent

39 (19.7%)

Very Good

26 (13.1%)

Good

31 (15.7%)

Average

102 (51.5%)

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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