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

As of October 2026, 0.75 to 0.99ct D SI1 natural round diamonds typically cost $1,426 USD to $4,682 USD, with a median price of $2,465 USD. There are currently 1,648 diamonds matching this specification available across retailers.

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

About 32% of these diamonds are available at multiple retailers, with an average price spread of 62%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct D SI1 Natural Round

Quick answer

As of October 2026, there are 1,648 natural round diamonds with D color and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $1,426 USD to $4,682 USD, with a median of $2,465 USD. At least 68 retailers stock this exact specification, and 32% of the stones appear at more than one of them, with an average price spread of 62%. Half of all listings fall between $2,148 USD and $3,818 USD per carat. The same specification in lab grown form lists at a median of about $423 USD per carat. Over the last 30 days the median price moved -2.3% and the number of listings moved +8.2%.

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. Round natural stones in the index: 2,248 USD per carat, +7.6% 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

1,648

Lowest Price

$858 USD

Highest Price

$7,990 USD

Average Price

$2,800 USD

Market Intelligence

Retailers Selling

Cross Retailer %

32.1%

Price Spread

61.5%

30-Day Price Trend

-2.3%

30-Day Supply Change

+8.2%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,715/ct

10th Percentile

$1,810

Median

$2,715

90th Percentile

$5,138

Score Distribution

3.4K diamonds scored across 4 quality tiers

Excellent

684 (20.0%)

Very Good

775 (22.7%)

Good

1,002 (29.3%)

Average

959 (28.0%)

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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

Save 17%

Lab-Grown D SI1Same specifications, lab-grown origin

Save 84%

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