How much does a 0.50 to 0.74ct H SI1 natural princess diamond cost?

As of October 2026, 0.50 to 0.74ct H SI1 natural princess diamonds typically cost £385 GBP to £690 GBP, with a median price of £524 GBP. There are currently 531 diamonds matching this specification available across retailers.

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

About 41% of these diamonds are available at multiple retailers, with an average price spread of 26%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct H SI1 Natural Princess

Quick answer

As of October 2026, there are 531 natural princess diamonds with H colour and SI1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run £385 GBP to £690 GBP, with a median of £524 GBP. At least 59 retailers stock this exact specification, and 41% of the stones appear at more than one of them, with an average price spread of 26%. Half of all listings fall between £724 GBP and £934 GBP per carat. The same specification in lab grown form lists at a median of about £614 GBP per carat. Over the last 30 days the median price moved -2.0% and the number of listings moved +53.9%.

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. Princess natural stones in the index: 2,158 USD per carat, +5.7% 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

531

Lowest Price

£299 GBP

Highest Price

£1,159 GBP

Average Price

£543 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

41.5%

Price Spread

25.7%

30-Day Price Trend

-2.0%

30-Day Supply Change

+53.9%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$1,085/ct

10th Percentile

$871

Median

$1,085

90th Percentile

$1,521

Score Distribution

1.1K diamonds scored across 4 quality tiers

Excellent

80 (7.0%)

Very Good

404 (35.3%)

Good

152 (13.3%)

Average

508 (44.4%)

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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 25%

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