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

As of October 2026, 0.75 to 0.99ct D SI1 natural oval diamonds typically cost £1,014 GBP to £2,888 GBP, with a median price of £1,654 GBP. There are currently 465 diamonds matching this specification available across retailers.

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

About 29% of these diamonds are available at multiple retailers, with an average price spread of 52%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct D SI1 Natural Oval

Quick answer

As of October 2026, there are 465 natural oval diamonds with D colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run £1,014 GBP to £2,888 GBP, with a median of £1,654 GBP. At least 63 retailers stock this exact specification, and 29% of the stones appear at more than one of them, with an average price spread of 52%. Half of all listings fall between £1,469 GBP and £2,397 GBP per carat. The same specification in lab grown form lists at a median of about £360 GBP per carat. Over the last 30 days the median price moved -0.8% and the number of listings moved -3.0%.

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. Oval natural stones in the index: 2,655 USD per carat, +10.2% 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

465

Lowest Price

£682 GBP

Highest Price

£4,891 GBP

Average Price

£1,832 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

29.0%

Price Spread

52.1%

30-Day Price Trend

-0.8%

30-Day Supply Change

-3.0%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,370/ct

10th Percentile

$1,680

Median

$2,370

90th Percentile

$4,351

Score Distribution

1.3K diamonds scored across 4 quality tiers

Excellent

227 (17.4%)

Very Good

346 (26.6%)

Good

218 (16.7%)

Average

512 (39.3%)

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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