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

As of October 2026, 0.75 to 0.99ct I SI1 natural princess diamonds typically cost HK$6,017 HKD to HK$16,918 HKD, with a median price of HK$9,325 HKD. There are currently 145 diamonds matching this specification available across retailers.

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

About 35% of these diamonds are available at multiple retailers, with an average price spread of 65%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct I SI1 Natural Princess

Quick answer

As of October 2026, there are 145 natural princess diamonds with I colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run HK$6,017 HKD to HK$16,918 HKD, with a median of HK$9,325 HKD. At least 61 retailers stock this exact specification, and 35% of the stones appear at more than one of them, with an average price spread of 65%. Half of all listings fall between HK$8,740 HKD and HK$15,923 HKD per carat. The same specification in lab grown form lists at a median of about HK$12,582 HKD per carat. Over the last 30 days the median price moved -8.9% and the number of listings moved +14.4%.

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 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

145

Lowest Price

HK$4,464 HKD

Highest Price

HK$36,532 HKD

Average Price

HK$10,740 HKD

Market Intelligence

Retailers Selling

Cross Retailer %

34.6%

Price Spread

65.2%

30-Day Price Trend

-8.9%

30-Day Supply Change

+14.4%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$1,405/ct

10th Percentile

$984

Median

$1,405

90th Percentile

$2,989

Score Distribution

372 diamonds scored across 4 quality tiers

Excellent

58 (15.6%)

Very Good

64 (17.2%)

Good

102 (27.4%)

Average

148 (39.8%)

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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