How much does a 1.00 to 1.49ct H SI1 natural radiant diamond cost?

As of September 2026, 1.00 to 1.49ct H SI1 natural radiant diamonds typically cost €1,485 EUR to €4,354 EUR, with a median price of €2,395 EUR. There are currently 780 diamonds matching this specification available across retailers.

Where can I find the best price on a H SI1 radiant diamond?

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1.00 to 1.49ct H SI1 Natural Radiant

Quick answer

As of September 2026, there are 780 natural radiant diamonds with H colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run €1,485 EUR to €4,354 EUR, with a median of €2,395 EUR. At least 61 retailers stock this exact specification. Half of all listings fall between €1,694 EUR and €2,665 EUR per carat. The same specification in lab grown form lists at a median of about €1,218 EUR 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

780

Lowest Price

€351 EUR

Highest Price

€14,109 EUR

Average Price

€2,679 EUR

Market Intelligence

Retailers Selling

Price Spread

46.8%

Price Range

Price per carat distribution across retailers

$2,377/ct

10th Percentile

$1,616

Median

$2,377

90th Percentile

$3,899

Score Distribution

780 diamonds scored across 4 quality tiers

Excellent

70 (9.0%)

Very Good

159 (20.4%)

Good

234 (30.0%)

Average

317 (40.6%)

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Consider Instead

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

H SI2SI2 inclusions are not visible without magnification

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Lab-Grown H SI1Same 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