How much does a 0.75 to 0.99ct E SI1 lab grown princess diamond cost?

As of October 2026, 0.75 to 0.99ct E SI1 lab grown princess diamonds typically cost $134 USD to $651 USD, with a median price of $417 USD. There are currently 17 diamonds matching this specification available across retailers.

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

About 37% of these diamonds are available at multiple retailers, with an average price spread of 111%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct E SI1 Lab Grown Princess

Quick answer

As of October 2026, there are 17 lab grown princess diamonds with E color and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $134 USD to $651 USD, with a median of $417 USD. At least 39 retailers stock this exact specification, and 37% of the stones appear at more than one of them, with an average price spread of 111%. Half of all listings fall between $205 USD and $617 USD per carat. The same specification in natural form lists at a median of about $1,846 USD per carat. Over the last 30 days the median price moved -4.3% and the number of listings moved +25.4%.

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 lab grown stones in the index: 461 USD per carat, -4.8% 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

Lowest Price

$98 USD

Highest Price

$1,560 USD

Average Price

$392 USD

Market Intelligence

Retailers Selling

Cross Retailer %

37.3%

Price Spread

111.0%

30-Day Price Trend

-4.3%

30-Day Supply Change

+25.4%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$371/ct

10th Percentile

$158

Median

$371

90th Percentile

$960

Score Distribution

40 diamonds scored across 4 quality tiers

Excellent

7 (17.5%)

Very Good

4 (10.0%)

Good

16 (40.0%)

Average

13 (32.5%)

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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