How much does a 2.00 to 2.99ct I SI2 natural marquise diamond cost?

As of November 2026, 2.00 to 2.99ct I SI2 natural marquise diamonds typically cost $9,877 AUD to $44,513 AUD, with a median price of $19,381 AUD. There are currently 178 diamonds matching this specification available across retailers.

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

About 44% of these diamonds are available at multiple retailers, with an average price spread of 47%. A comparison tool like Carat Hunter lets you see all the prices side by side.

2.00 to 2.99ct I SI2 Natural Marquise

Quick answer

As of November 2026, there are 178 natural marquise diamonds with I colour and SI2 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run $9,877 AUD to $44,513 AUD, with a median of $19,381 AUD. At least 52 retailers stock this exact specification, and 44% of the stones appear at more than one of them, with an average price spread of 47%. Half of all listings fall between $7,328 AUD and $12,022 AUD per carat. Over the last 30 days the median price moved -3.9% and the number of listings moved +27.3%.

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: November 2026

Available

178

Lowest Price

$6,693 AUD

Highest Price

$92,208 AUD

Average Price

$23,928 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

43.9%

Price Spread

46.8%

30-Day Price Trend

-3.9%

30-Day Supply Change

+27.3%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$7,048/ct

10th Percentile

$3,886

Median

$7,048

90th Percentile

$9,719

Score Distribution

435 diamonds scored across 4 quality tiers

Excellent

95 (21.8%)

Very Good

125 (28.7%)

Good

85 (19.5%)

Average

130 (29.9%)

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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