How much does a 1.50 to 1.99ct E SI1 natural princess diamond cost?

As of October 2026, 1.50 to 1.99ct E SI1 natural princess diamonds typically cost $6,138 AUD to $20,288 AUD, with a median price of $9,708 AUD. There are currently 147 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 71%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct E SI1 Natural Princess

Quick answer

As of October 2026, there are 147 natural princess diamonds with E colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $6,138 AUD to $20,288 AUD, with a median of $9,708 AUD. At least 59 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 71%. Half of all listings fall between $4,999 AUD and $9,804 AUD per carat. The same specification in lab grown form lists at a median of about $518 AUD per carat. Over the last 30 days the median price moved -5.2% and the number of listings moved +3.6%.

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

147

Lowest Price

$4,662 AUD

Highest Price

$35,664 AUD

Average Price

$11,899 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

36.3%

Price Spread

71.5%

30-Day Price Trend

-5.2%

30-Day Supply Change

+3.6%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$4,725/ct

10th Percentile

$3,048

Median

$4,725

90th Percentile

$8,913

Score Distribution

385 diamonds scored across 4 quality tiers

Excellent

61 (15.8%)

Very Good

83 (21.6%)

Good

106 (27.5%)

Average

135 (35.1%)

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Consider Instead

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

E SI2SI2 inclusions are not visible without magnification

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Lab-Grown E 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