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

As of September 2026, 1.00 to 1.49ct H SI2 natural radiant diamonds typically cost £1,012 GBP to £3,218 GBP, with a median price of £1,812 GBP. There are currently 562 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct H SI2 Natural Radiant

Quick answer

As of September 2026, there are 562 natural radiant diamonds with H colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,012 GBP to £3,218 GBP, with a median of £1,812 GBP. At least 46 retailers stock this exact specification. Half of all listings fall between £1,255 GBP and £2,032 GBP per carat. The same specification in lab grown form lists at a median of about £1,266 GBP per carat.

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. Radiant natural stones in the index: 2,765 USD per carat, +6.0% 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

562

Lowest Price

£294 GBP

Highest Price

£5,990 GBP

Average Price

£1,985 GBP

Market Intelligence

Retailers Selling

Price Spread

49.2%

Price Range

Price per carat distribution across retailers

$2,130/ct

10th Percentile

$1,435

Median

$2,130

90th Percentile

$3,380

Score Distribution

562 diamonds scored across 4 quality tiers

Excellent

53 (9.4%)

Very Good

152 (27.0%)

Good

120 (21.4%)

Average

237 (42.2%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

Lab-Grown H SI2Same specifications, lab-grown origin

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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