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

As of November 6, 2026, 1.00 to 1.49ct K SI2 natural marquise diamonds typically cost €1,068 EUR to €2,526 EUR, with a median price of €1,720 EUR. There are currently 360 diamonds matching this specification available across retailers.

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

About 40% of these diamonds are available at multiple retailers, with an average price spread of 53%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct K SI2 Natural Marquise

Quick answer

As of November 6, 2026, there are 360 natural marquise diamonds with K colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run €1,068 EUR to €2,526 EUR, with a median of €1,720 EUR. Half of all listings fall between €1,183 EUR and €2,044 EUR per carat. The same specification in lab grown form lists at a median of about €1,330 EUR per carat. Over the last 30 days the median price moved +0.6% and the number of listings moved +14.5%.

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 125 retailers. The index is a monthly release.

Last updated: November 6, 2026

Available

360

Lowest Price

€725 EUR

Highest Price

€5,479 EUR

Average Price

€1,772 EUR

Market Intelligence

Cross Retailer %

40.3%

Price Spread

53.2%

30-Day Price Trend

+0.6%

30-Day Supply Change

+14.5%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,816/ct

10th Percentile

$1,159

Median

$1,816

90th Percentile

$2,616

Score Distribution

360 diamonds scored across 4 quality tiers

Excellent

59 (16.4%)

Very Good

121 (33.6%)

Good

90 (25.0%)

Average

90 (25.0%)

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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