How much does a 2.00 to 2.99ct K SI1 natural radiant diamond cost?

As of November 7, 2026, 2.00 to 2.99ct K SI1 natural radiant diamonds typically cost £4,035 GBP to £10,044 GBP, with a median price of £6,449 GBP. There are currently 152 diamonds matching this specification available across retailers.

Where can I find the best price on a K SI1 radiant diamond?

About 50% of these diamonds are available at multiple retailers, with an average price spread of 43%. A comparison tool like Carat Hunter lets you see all the prices side by side.

2.00 to 2.99ct K SI1 Natural Radiant

Quick answer

As of November 7, 2026, there are 152 natural radiant diamonds with K colour and SI1 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run £4,035 GBP to £10,044 GBP, with a median of £6,449 GBP. Half of all listings fall between £2,488 GBP and £3,787 GBP per carat. Over the last 30 days the median price moved -1.6% and the number of listings moved +21.9%.

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

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Radiant natural stones in the index: 3,108 USD per carat, +0.3% month on month. See the full index release

Figures come from current listings across more than 125 retailers. The index is a monthly release.

Last updated: November 7, 2026

Available

152

Lowest Price

£1,959 GBP

Highest Price

£18,218 GBP

Average Price

£6,855 GBP

Market Intelligence

Cross Retailer %

50.0%

Price Spread

43.4%

30-Day Price Trend

-1.6%

30-Day Supply Change

+21.9%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$4,008/ct

10th Percentile

$2,641

Median

$4,008

90th Percentile

$5,764

Score Distribution

152 diamonds scored across 4 quality tiers

Excellent

46 (30.3%)

Very Good

43 (28.3%)

Good

20 (13.2%)

Average

43 (28.3%)

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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