How much does a 1.00 to 1.49ct H SI2 natural radiant diamond cost?

As of October 2026, 1.00 to 1.49ct H SI2 natural radiant diamonds typically cost £1,106 GBP to £3,356 GBP, with a median price of £2,016 GBP. There are currently 185 diamonds matching this specification available across retailers.

Where can I find the best price on a H SI2 radiant diamond?

About 33% of these diamonds are available at multiple retailers, with an average price spread of 56%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct H SI2 Natural Radiant

Quick answer

As of October 2026, there are 185 natural radiant diamonds with H colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,106 GBP to £3,356 GBP, with a median of £2,016 GBP. At least 51 retailers stock this exact specification, and 33% of the stones appear at more than one of them, with an average price spread of 56%. Half of all listings fall between £1,246 GBP and £2,130 GBP per carat. Over the last 30 days the median price moved -0.4% and the number of listings moved +14.0%.

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: October 2026

Available

185

Lowest Price

£642 GBP

Highest Price

£6,033 GBP

Average Price

£2,131 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

32.6%

Price Spread

55.5%

30-Day Price Trend

-0.4%

30-Day Supply Change

+14.0%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,132/ct

10th Percentile

$1,370

Median

$2,132

90th Percentile

$3,766

Score Distribution

565 diamonds scored across 4 quality tiers

Excellent

74 (13.1%)

Very Good

94 (16.6%)

Good

112 (19.8%)

Average

285 (50.4%)

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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