How much does a 0.75 to 0.99ct D SI2 natural round diamond cost?

As of October 2026, 0.75 to 0.99ct D SI2 natural round diamonds typically cost £963 GBP to £2,970 GBP, with a median price of £1,614 GBP. There are currently 1,187 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 63%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct D SI2 Natural Round

Quick answer

As of October 2026, there are 1,187 natural round diamonds with D colour and SI2 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run £963 GBP to £2,970 GBP, with a median of £1,614 GBP. At least 59 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 63%. Half of all listings fall between £1,341 GBP and £2,410 GBP per carat. The same specification in lab grown form lists at a median of about £366 GBP 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

1,187

Lowest Price

£568 GBP

Highest Price

£5,747 GBP

Average Price

£1,818 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

36.1%

Price Spread

62.7%

30-Day Price Trend

-2.3%

30-Day Supply Change

+8.2%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,264/ct

10th Percentile

$1,477

Median

$2,264

90th Percentile

$4,460

Score Distribution

2.3K diamonds scored across 4 quality tiers

Excellent

519 (23.0%)

Very Good

531 (23.5%)

Good

601 (26.6%)

Average

605 (26.8%)

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Consider Instead

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

D I1I1 inclusions are not visible without magnification

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Lab-Grown D SI2Same 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