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

As of November 6, 2026, 2.00 to 2.99ct K SI1 natural cushion diamonds typically cost £3,166 GBP to £9,360 GBP, with a median price of £5,581 GBP. There are currently 341 diamonds matching this specification available across retailers.

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

About 39% of these diamonds are available at multiple retailers, with an average price spread of 61%. A comparison tool like Carat Hunter lets you see all the prices side by side.

2.00 to 2.99ct K SI1 Natural Cushion

Quick answer

As of November 6, 2026, there are 341 natural cushion diamonds with K colour and SI1 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run £3,166 GBP to £9,360 GBP, with a median of £5,581 GBP. Half of all listings fall between £1,899 GBP and £3,499 GBP per carat. The same specification in lab grown form lists at a median of about £794 GBP per carat. Over the last 30 days the median price moved -1.7% and the number of listings moved +7.6%.

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. Cushion natural stones in the index: 2,881 USD per carat, -2.5% 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 6, 2026

Available

341

Lowest Price

£1,618 GBP

Highest Price

£20,183 GBP

Average Price

£5,971 GBP

Market Intelligence

Cross Retailer %

39.0%

Price Spread

61.1%

30-Day Price Trend

-1.7%

30-Day Supply Change

+7.6%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$3,505/ct

10th Percentile

$2,088

Median

$3,505

90th Percentile

$5,649

Score Distribution

341 diamonds scored across 4 quality tiers

Excellent

66 (19.4%)

Very Good

82 (24.0%)

Good

90 (26.4%)

Average

103 (30.2%)

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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