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

As of October 2026, 0.75 to 0.99ct D SI1 natural radiant diamonds typically cost $1,267 USD to $3,476 USD, with a median price of $2,267 USD. There are currently 70 diamonds matching this specification available across retailers.

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

About 29% of these diamonds are available at multiple retailers, with an average price spread of 57%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct D SI1 Natural Radiant

Quick answer

As of October 2026, there are 70 natural radiant diamonds with D color and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $1,267 USD to $3,476 USD, with a median of $2,267 USD. At least 57 retailers stock this exact specification, and 29% of the stones appear at more than one of them, with an average price spread of 57%. Half of all listings fall between $1,892 USD and $3,314 USD per carat. The same specification in lab grown form lists at a median of about $433 USD per carat. Over the last 30 days the median price moved -1.0% and the number of listings moved +13.8%.

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. Radiant natural stones in the index: 3,091 USD per carat, +13.2% 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: October 2026

Available

Lowest Price

$599 USD

Highest Price

$6,196 USD

Average Price

$2,322 USD

Market Intelligence

Retailers Selling

Cross Retailer %

28.8%

Price Spread

57.1%

30-Day Price Trend

-1.0%

30-Day Supply Change

+13.8%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,489/ct

10th Percentile

$1,537

Median

$2,489

90th Percentile

$4,630

Score Distribution

264 diamonds scored across 4 quality tiers

Excellent

33 (12.5%)

Very Good

48 (18.2%)

Good

52 (19.7%)

Average

131 (49.6%)

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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