How much does a 2.00 to 2.99ct J SI2 lab grown round diamond cost?

As of October 2026, 2.00 to 2.99ct J SI2 lab grown round diamonds typically cost £685 GBP to £2,305 GBP, with a median price of £1,332 GBP. There are currently 198 diamonds matching this specification available across retailers.

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

About 63% 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.

2.00 to 2.99ct J SI2 Lab Grown Round

Quick answer

As of October 2026, there are 198 lab grown round diamonds with J colour and SI2 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run £685 GBP to £2,305 GBP, with a median of £1,332 GBP. At least 17 retailers stock this exact specification, and 63% of the stones appear at more than one of them, with an average price spread of 59%. Half of all listings fall between £868 GBP and £1,417 GBP per carat. The same specification in natural form lists at a median of about £3,928 GBP per carat. Over the last 30 days the median price moved -0.4% and the number of listings moved +1.2%.

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

198

Lowest Price

£382 GBP

Highest Price

£6,808 GBP

Average Price

£1,456 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

63.1%

Price Spread

59.4%

30-Day Price Trend

-0.4%

30-Day Supply Change

+1.2%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,229/ct

10th Percentile

$1,050

Median

$1,229

90th Percentile

$2,625

Score Distribution

350 diamonds scored across 4 quality tiers

Excellent

165 (47.1%)

Very Good

58 (16.6%)

Good

121 (34.6%)

Average

6 (1.7%)

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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