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

As of September 2026, 2.00 to 2.99ct I SI2 lab grown round diamonds typically cost £667 GBP to £12,498 GBP, with a median price of £2,861 GBP. There are currently 388 diamonds matching this specification available across retailers.

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

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2.00 to 2.99ct I SI2 Lab Grown Round

Quick answer

As of September 2026, there are 388 lab grown round diamonds with I colour and SI2 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run £667 GBP to £12,498 GBP, with a median of £2,861 GBP. At least 24 retailers stock this exact specification. Half of all listings fall between £705 GBP and £1,655 GBP per carat. The same specification in natural form lists at a median of about £4,867 GBP per carat.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Round lab grown stones in the index: 438 USD per carat, -14.1% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

388

Lowest Price

£289 GBP

Highest Price

£25,875 GBP

Average Price

£4,400 GBP

Market Intelligence

Retailers Selling

Price Spread

60.0%

Price Range

Price per carat distribution across retailers

$2,138/ct

10th Percentile

$446

Median

$2,138

90th Percentile

$7,756

Score Distribution

388 diamonds scored across 4 quality tiers

Excellent

78 (20.1%)

Very Good

98 (25.3%)

Good

161 (41.5%)

Average

51 (13.1%)

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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