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

As of October 2026, 1.00 to 1.49ct D SI1 natural princess diamonds typically cost £1,390 GBP to £4,381 GBP, with a median price of £2,075 GBP. There are currently 150 diamonds matching this specification available across retailers.

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

About 42% of these diamonds are available at multiple retailers, with an average price spread of 67%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct D SI1 Natural Princess

Quick answer

As of October 2026, there are 150 natural princess diamonds with D colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,390 GBP to £4,381 GBP, with a median of £2,075 GBP. At least 63 retailers stock this exact specification, and 42% of the stones appear at more than one of them, with an average price spread of 67%. Half of all listings fall between £1,540 GBP and £2,788 GBP per carat. The same specification in lab grown form lists at a median of about £274 GBP per carat. Over the last 30 days the median price moved -3.2% and the number of listings moved +15.7%.

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

150

Lowest Price

£1,067 GBP

Highest Price

£6,641 GBP

Average Price

£2,534 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

42.1%

Price Spread

67.2%

30-Day Price Trend

-3.2%

30-Day Supply Change

+15.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$2,475/ct

10th Percentile

$1,812

Median

$2,475

90th Percentile

$4,738

Score Distribution

335 diamonds scored across 4 quality tiers

Excellent

60 (17.9%)

Very Good

75 (22.4%)

Good

72 (21.5%)

Average

128 (38.2%)

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Consider Instead

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

D SI2SI2 inclusions are not visible without magnification

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Lab-Grown D 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