How much does a 0.20 to 0.49ct D SI2 natural marquise diamond cost?

As of November 6, 2026, 0.20 to 0.49ct D SI2 natural marquise diamonds typically cost £204 GBP to £539 GBP, with a median price of £321 GBP. There are currently 1,078 diamonds matching this specification available across retailers.

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

About 31% of these diamonds are available at multiple retailers, with an average price spread of 39%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct D SI2 Natural Marquise

Quick answer

As of November 6, 2026, there are 1,078 natural marquise diamonds with D colour and SI2 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run £204 GBP to £539 GBP, with a median of £321 GBP. Half of all listings fall between £735 GBP and £1,102 GBP per carat. The same specification in lab grown form lists at a median of about £406 GBP per carat. Over the last 30 days the median price moved +3.8% and the number of listings moved +23.5%.

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

1,078

Lowest Price

£128 GBP

Highest Price

£1,096 GBP

Average Price

£353 GBP

Market Intelligence

Cross Retailer %

30.7%

Price Spread

38.7%

30-Day Price Trend

+3.8%

30-Day Supply Change

+23.5%

Volatility (30d)

0.03

Price Range

Price per carat distribution across retailers

$1,276/ct

10th Percentile

$900

Median

$1,276

90th Percentile

$1,876

Score Distribution

1.1K diamonds scored across 4 quality tiers

Excellent

105 (9.7%)

Very Good

332 (30.8%)

Good

201 (18.6%)

Average

440 (40.8%)

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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