How much does a 0.75 to 0.99ct D SI1 natural marquise diamond cost?

As of October 2026, 0.75 to 0.99ct D SI1 natural marquise diamonds typically cost $1,973 USD to $4,790 USD, with a median price of $2,991 USD. There are currently 112 diamonds matching this specification available across retailers.

Where can I find the best price on a D SI1 marquise diamond?

About 27% 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.

0.75 to 0.99ct D SI1 Natural Marquise

Quick answer

As of October 2026, there are 112 natural marquise diamonds with D color and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $1,973 USD to $4,790 USD, with a median of $2,991 USD. At least 57 retailers stock this exact specification, and 27% of the stones appear at more than one of them, with an average price spread of 47%. Half of all listings fall between $2,547 USD and $3,991 USD per carat. The same specification in lab grown form lists at a median of about $408 USD per carat. Over the last 30 days the median price moved -1.1% and the number of listings moved +2.1%.

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: October 2026

Available

112

Lowest Price

$961 USD

Highest Price

$8,000 USD

Average Price

$3,225 USD

Market Intelligence

Retailers Selling

Cross Retailer %

26.6%

Price Spread

46.5%

30-Day Price Trend

-1.1%

30-Day Supply Change

+2.1%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$3,105/ct

10th Percentile

$2,115

Median

$3,105

90th Percentile

$5,265

Score Distribution

287 diamonds scored across 4 quality tiers

Excellent

22 (7.7%)

Very Good

67 (23.3%)

Good

54 (18.8%)

Average

144 (50.2%)

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Consider Instead

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

D SI2SI2 inclusions are not visible without magnification

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Lab-Grown D SI1Same specifications, lab-grown origin

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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