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

As of October 2026, 0.75 to 0.99ct H SI1 lab grown princess diamonds typically cost $473 USD to $2,013 USD, with a median price of $1,492 USD. There are currently 8 diamonds matching this specification available across retailers.

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

About 24% of these diamonds are available at multiple retailers, with an average price spread of 87%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct H SI1 Lab Grown Princess

Quick answer

As of October 2026, there are 8 lab grown princess diamonds with H color and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $473 USD to $2,013 USD, with a median of $1,492 USD. At least 17 retailers stock this exact specification, and 24% of the stones appear at more than one of them, with an average price spread of 87%. Half of all listings fall between $997 USD and $2,392 USD per carat. The same specification in natural form lists at a median of about $1,405 USD per carat. Over the last 30 days the median price moved +4.2% and the number of listings moved +5.9%.

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 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

$410 USD

Highest Price

$3,868 USD

Average Price

$1,309 USD

Market Intelligence

Retailers Selling

Cross Retailer %

23.5%

Price Spread

87.0%

30-Day Price Trend

+4.2%

30-Day Supply Change

+5.9%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,603/ct

10th Percentile

$760

Median

$1,603

90th Percentile

$3,147

Score Distribution

13 diamonds scored across 4 quality tiers

Excellent

3 (23.1%)

Very Good

2 (15.4%)

Good

1 (7.7%)

Average

7 (53.8%)

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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