How much does a 0.75 to 0.99ct J SI1 natural princess diamond cost?

As of October 2026, 0.75 to 0.99ct J SI1 natural princess diamonds typically cost €637 EUR to €2,003 EUR, with a median price of €965 EUR. There are currently 134 diamonds matching this specification available across retailers.

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

About 35% 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.

0.75 to 0.99ct J SI1 Natural Princess

Quick answer

As of October 2026, there are 134 natural princess diamonds with J colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run €637 EUR to €2,003 EUR, with a median of €965 EUR. At least 54 retailers stock this exact specification, and 35% of the stones appear at more than one of them, with an average price spread of 67%. Half of all listings fall between €850 EUR and €1,567 EUR per carat. The same specification in lab grown form lists at a median of about €577 EUR per carat. Over the last 30 days the median price moved -3.9% and the number of listings moved +10.3%.

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

134

Lowest Price

€458 EUR

Highest Price

€3,409 EUR

Average Price

€1,130 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

34.6%

Price Spread

66.7%

30-Day Price Trend

-3.9%

30-Day Supply Change

+10.3%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,200/ct

10th Percentile

$823

Median

$1,200

90th Percentile

$2,561

Score Distribution

348 diamonds scored across 4 quality tiers

Excellent

38 (10.9%)

Very Good

55 (15.8%)

Good

94 (27.0%)

Average

161 (46.3%)

Find Your Diamond

Search 134 J SI1 princess diamonds and compare prices.

Search Diamonds

Consider Instead

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

Lab-Grown J SI1Same specifications, lab-grown origin

Save 46%

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