How much does a 1.00 to 1.49ct K I1 natural round diamond cost?

As of November 6, 2026, 1.00 to 1.49ct K I1 natural round diamonds typically cost £676 GBP to £2,471 GBP, with a median price of £1,257 GBP. There are currently 729 diamonds matching this specification available across retailers.

Where can I find the best price on a K I1 round diamond?

About 34% of these diamonds are available at multiple retailers, with an average price spread of 76%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct K I1 Natural Round

Quick answer

As of November 6, 2026, there are 729 natural round diamonds with K colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £676 GBP to £2,471 GBP, with a median of £1,257 GBP. Half of all listings fall between £854 GBP and £1,742 GBP per carat. The same specification in lab grown form lists at a median of about £890 GBP per carat. Over the last 30 days the median price moved -2.6% and the number of listings moved +4.3%.

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. Round natural stones in the index: 2,124 USD per carat, -6.9% 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

729

Lowest Price

£446 GBP

Highest Price

£4,831 GBP

Average Price

£1,461 GBP

Market Intelligence

Cross Retailer %

34.2%

Price Spread

76.1%

30-Day Price Trend

-2.6%

30-Day Supply Change

+4.3%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,570/ct

10th Percentile

$876

Median

$1,570

90th Percentile

$3,154

Score Distribution

729 diamonds scored across 4 quality tiers

Excellent

42 (5.8%)

Very Good

192 (26.3%)

Good

114 (15.6%)

Average

381 (52.3%)

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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