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

As of September 2026, 1.00 to 1.49ct D I1 natural round diamonds typically cost £1,278 GBP to £3,824 GBP, with a median price of £2,037 GBP. There are currently 720 diamonds matching this specification available across retailers.

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

About 54% of these diamonds are available at multiple retailers, with an average price spread of 44%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct D I1 Natural Round

Quick answer

As of September 2026, there are 720 natural round diamonds with D colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,278 GBP to £3,824 GBP, with a median of £2,037 GBP. At least 26 retailers stock this exact specification, and 54% of the stones appear at more than one of them, with an average price spread of 44%. Half of all listings fall between £1,484 GBP and £2,298 GBP per carat. The same specification in lab grown form lists at a median of about £1,005 GBP per carat. Over the last 30 days the median price moved -5.3% and the number of listings moved +17.7%.

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 natural stones in the index: 2,094 USD per carat, -3.8% 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

720

Lowest Price

£626 GBP

Highest Price

£8,144 GBP

Average Price

£2,302 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

54.0%

Price Spread

44.1%

30-Day Price Trend

-5.3%

30-Day Supply Change

+17.7%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$2,490/ct

10th Percentile

$1,639

Median

$2,490

90th Percentile

$4,067

Score Distribution

720 diamonds scored across 4 quality tiers

Excellent

126 (17.5%)

Very Good

196 (27.2%)

Good

170 (23.6%)

Average

228 (31.7%)

Find Your Diamond

Search 720 D I1 round diamonds and compare prices.

Search Diamonds

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