How much does a 1.50 to 1.99ct E SI2 natural marquise diamond cost?

As of October 2026, 1.50 to 1.99ct E SI2 natural marquise diamonds typically cost $7,586 AUD to $27,929 AUD, with a median price of $13,015 AUD. There are currently 130 diamonds matching this specification available across retailers.

Where can I find the best price on a E SI2 marquise diamond?

About 36% of these diamonds are available at multiple retailers, with an average price spread of 42%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct E SI2 Natural Marquise

Quick answer

As of October 2026, there are 130 natural marquise diamonds with E colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $7,586 AUD to $27,929 AUD, with a median of $13,015 AUD. At least 54 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 42%. Half of all listings fall between $7,457 AUD and $11,344 AUD per carat. The same specification in lab grown form lists at a median of about $415 AUD per carat. Over the last 30 days the median price moved -1.1% and the number of listings moved +15.1%.

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. Marquise natural stones in the index: 2,268 USD per carat, +10.8% 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

130

Lowest Price

$5,657 AUD

Highest Price

$46,394 AUD

Average Price

$15,759 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

35.8%

Price Spread

42.1%

30-Day Price Trend

-1.1%

30-Day Supply Change

+15.1%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$6,478/ct

10th Percentile

$4,060

Median

$6,478

90th Percentile

$9,736

Score Distribution

332 diamonds scored across 4 quality tiers

Excellent

82 (24.7%)

Very Good

89 (26.8%)

Good

46 (13.9%)

Average

115 (34.6%)

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Consider Instead

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

F SI2F colour is visually identical to E to the naked eye

Save 15%

Lab-Grown E SI2Same specifications, lab-grown origin

Save 96%

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