How much does a 1.50 to 1.99ct H SI2 natural princess diamond cost?

As of October 2026, 1.50 to 1.99ct H SI2 natural princess diamonds typically cost £2,255 GBP to £6,748 GBP, with a median price of £4,086 GBP. There are currently 144 diamonds matching this specification available across retailers.

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

About 30% of these diamonds are available at multiple retailers, with an average price spread of 53%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct H SI2 Natural Princess

Quick answer

As of October 2026, there are 144 natural princess diamonds with H colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £2,255 GBP to £6,748 GBP, with a median of £4,086 GBP. At least 52 retailers stock this exact specification, and 30% of the stones appear at more than one of them, with an average price spread of 53%. Half of all listings fall between £1,782 GBP and £3,025 GBP per carat. The same specification in lab grown form lists at a median of about £645 GBP per carat. Over the last 30 days the median price moved -2.4% and the number of listings moved +5.7%.

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

144

Lowest Price

£1,491 GBP

Highest Price

£10,553 GBP

Average Price

£4,321 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

29.8%

Price Spread

52.7%

30-Day Price Trend

-2.4%

30-Day Supply Change

+5.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$3,140/ct

10th Percentile

$1,958

Median

$3,140

90th Percentile

$4,922

Score Distribution

445 diamonds scored across 4 quality tiers

Excellent

62 (13.9%)

Very Good

85 (19.1%)

Good

60 (13.5%)

Average

238 (53.5%)

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Consider Instead

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

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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