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

As of October 2026, 2.00 to 2.99ct G SI1 lab grown cushion diamonds typically cost £387 GBP to £1,715 GBP, with a median price of £807 GBP. There are currently 54 diamonds matching this specification available across retailers.

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

About 26% of these diamonds are available at multiple retailers, with an average price spread of 93%. A comparison tool like Carat Hunter lets you see all the prices side by side.

2.00 to 2.99ct G SI1 Lab Grown Cushion

Quick answer

As of October 2026, there are 54 lab grown cushion diamonds with G colour and SI1 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run £387 GBP to £1,715 GBP, with a median of £807 GBP. At least 34 retailers stock this exact specification, and 26% of the stones appear at more than one of them, with an average price spread of 93%. Half of all listings fall between £233 GBP and £587 GBP per carat. The same specification in natural form lists at a median of about £6,484 GBP per carat. Over the last 30 days the median price moved +6.7% and the number of listings moved +2.8%.

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

£210 GBP

Highest Price

£4,859 GBP

Average Price

£1,047 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

26.0%

Price Spread

92.9%

30-Day Price Trend

+6.7%

30-Day Supply Change

+2.8%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$510/ct

10th Percentile

$233

Median

$510

90th Percentile

$1,444

Score Distribution

147 diamonds scored across 4 quality tiers

Excellent

17 (11.6%)

Very Good

21 (14.3%)

Good

50 (34.0%)

Average

59 (40.1%)

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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