How much does a 1.00 to 1.49ct I SI2 natural marquise diamond cost?

As of November 2026, 1.00 to 1.49ct I SI2 natural marquise diamonds typically cost €1,252 EUR to €3,827 EUR, with a median price of €2,204 EUR. There are currently 474 diamonds matching this specification available across retailers.

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

About 42% of these diamonds are available at multiple retailers, with an average price spread of 54%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct I SI2 Natural Marquise

Quick answer

As of November 2026, there are 474 natural marquise diamonds with I colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run €1,252 EUR to €3,827 EUR, with a median of €2,204 EUR. At least 56 retailers stock this exact specification, and 42% of the stones appear at more than one of them, with an average price spread of 54%. Half of all listings fall between €1,856 EUR and €3,163 EUR per carat. Over the last 30 days the median price moved +0.5% and the number of listings moved +17.6%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Marquise natural stones in the index: 2,177 USD per carat, -4.2% 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

474

Lowest Price

€728 EUR

Highest Price

€9,518 EUR

Average Price

€2,458 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

41.5%

Price Spread

54.0%

30-Day Price Trend

+0.5%

30-Day Supply Change

+17.6%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,713/ct

10th Percentile

$1,622

Median

$2,713

90th Percentile

$4,600

Score Distribution

1.0K diamonds scored across 4 quality tiers

Excellent

221 (21.2%)

Very Good

318 (30.5%)

Good

246 (23.6%)

Average

259 (24.8%)

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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