How much does a 1.50 to 1.99ct D I1 natural radiant diamond cost?

As of November 2026, 1.50 to 1.99ct D I1 natural radiant diamonds typically cost £4,587 GBP to £15,992 GBP, with a median price of £7,990 GBP. There are currently 4 diamonds matching this specification available across retailers.

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

About 7% of these diamonds are available at multiple retailers, with an average price spread of 38%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct D I1 Natural Radiant

Quick answer

As of November 2026, there are 4 natural radiant diamonds with D colour and I1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £4,587 GBP to £15,992 GBP, with a median of £7,990 GBP. At least 23 retailers stock this exact specification, and 7% of the stones appear at more than one of them, with an average price spread of 38%. Half of all listings fall between £2,415 GBP and £3,696 GBP per carat. Over the last 30 days the median price moved -0.1% and the number of listings moved +2.5%.

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

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Radiant natural stones in the index: 3,091 USD per carat, +13.2% month on month. See the full index release

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

Last updated: November 2026

Available

Lowest Price

£3,550 GBP

Highest Price

£16,707 GBP

Average Price

£9,804 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

7.3%

Price Spread

38.4%

30-Day Price Trend

-0.1%

30-Day Supply Change

+2.5%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$4,470/ct

10th Percentile

$2,752

Median

$4,470

90th Percentile

$5,294

Score Distribution

23 diamonds scored across 3 quality tiers

Excellent

3 (13.0%)

Good

2 (8.7%)

Average

18 (78.3%)

Find Your Diamond

Search 4 D I1 radiant 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