How much does a 3.00 to 4.99ct I SI2 natural marquise diamond cost?

As of November 2026, 3.00 to 4.99ct I SI2 natural marquise diamonds typically cost €15,166 EUR to €55,602 EUR, with a median price of €29,567 EUR. There are currently 46 diamonds matching this specification available across retailers.

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

About 45% of these diamonds are available at multiple retailers, with an average price spread of 55%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct I SI2 Natural Marquise

Quick answer

As of November 2026, there are 46 natural marquise diamonds with I color and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run €15,166 EUR to €55,602 EUR, with a median of €29,567 EUR. At least 48 retailers stock this exact specification, and 45% of the stones appear at more than one of them, with an average price spread of 55%. Half of all listings fall between €6,362 EUR and €11,587 EUR per carat. Over the last 30 days the median price moved -3.8% and the number of listings moved +35.6%.

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. 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

Lowest Price

€10,698 EUR

Highest Price

€68,966 EUR

Average Price

€32,018 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

45.4%

Price Spread

54.5%

30-Day Price Trend

-3.8%

30-Day Supply Change

+35.6%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$10,708/ct

10th Percentile

$5,669

Median

$10,708

90th Percentile

$15,075

Score Distribution

94 diamonds scored across 4 quality tiers

Excellent

21 (22.3%)

Very Good

28 (29.8%)

Good

19 (20.2%)

Average

26 (27.7%)

Find Your Diamond

Search 46 I SI2 marquise diamonds and compare prices.

Search Diamonds

Consider Instead

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

J SI2J colour is visually identical to I to the naked eye

Save 18%

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