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

As of September 2026, 1.00 to 1.49ct H SI1 natural princess diamonds typically cost £1,184 GBP to £3,223 GBP, with a median price of £1,713 GBP. There are currently 1,017 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct H SI1 Natural Princess

Quick answer

As of September 2026, there are 1,017 natural princess diamonds with H colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,184 GBP to £3,223 GBP, with a median of £1,713 GBP. At least 56 retailers stock this exact specification. Half of all listings fall between £1,313 GBP and £1,983 GBP per carat. The same specification in lab grown form lists at a median of about £1,033 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. Princess natural stones in the index: 2,073 USD per carat, -3.2% 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

1,017

Lowest Price

£401 GBP

Highest Price

£8,317 GBP

Average Price

£1,986 GBP

Market Intelligence

Retailers Selling

Price Spread

42.6%

Price Range

Price per carat distribution across retailers

$2,126/ct

10th Percentile

$1,530

Median

$2,126

90th Percentile

$3,477

Score Distribution

1.0K diamonds scored across 4 quality tiers

Excellent

102 (10.0%)

Very Good

247 (24.3%)

Good

334 (32.8%)

Average

334 (32.8%)

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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

Save 9%

Lab-Grown H SI1Same specifications, lab-grown origin

Save 37%

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