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

As of October 2026, 2.00 to 2.99ct D SI1 lab grown round diamonds typically cost £231 GBP to £1,974 GBP, with a median price of £657 GBP. There are currently 339 diamonds matching this specification available across retailers.

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

About 31% of these diamonds are available at multiple retailers, with an average price spread of 85%. A comparison tool like Carat Hunter lets you see all the prices side by side.

2.00 to 2.99ct D SI1 Lab Grown Round

Quick answer

As of October 2026, there are 339 lab grown round diamonds with D colour and SI1 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run £231 GBP to £1,974 GBP, with a median of £657 GBP. At least 38 retailers stock this exact specification, and 31% of the stones appear at more than one of them, with an average price spread of 85%. Half of all listings fall between £181 GBP and £429 GBP per carat. The same specification in natural form lists at a median of about £8,977 GBP per carat. Over the last 30 days the median price moved +4.5% and the number of listings moved +17.3%.

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. Round lab grown stones in the index: 414 USD per carat, -5.0% 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

339

Lowest Price

£180 GBP

Highest Price

£3,718 GBP

Average Price

£857 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

31.1%

Price Spread

84.9%

30-Day Price Trend

+4.5%

30-Day Supply Change

+17.3%

Volatility (30d)

0.03

Price Range

Price per carat distribution across retailers

$388/ct

10th Percentile

$153

Median

$388

90th Percentile

$860

Score Distribution

760 diamonds scored across 4 quality tiers

Excellent

224 (29.5%)

Very Good

79 (10.4%)

Good

155 (20.4%)

Average

302 (39.7%)

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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