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

As of October 2026, 0.75 to 0.99ct J SI2 natural round diamonds typically cost £624 GBP to £1,708 GBP, with a median price of £981 GBP. There are currently 839 diamonds matching this specification available across retailers.

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

About 40% of these diamonds are available at multiple retailers, with an average price spread of 60%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct J SI2 Natural Round

Quick answer

As of October 2026, there are 839 natural round diamonds with J colour and SI2 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run £624 GBP to £1,708 GBP, with a median of £981 GBP. At least 56 retailers stock this exact specification, and 40% of the stones appear at more than one of them, with an average price spread of 60%. Half of all listings fall between £852 GBP and £1,488 GBP per carat. The same specification in lab grown form lists at a median of about £750 GBP per carat. Over the last 30 days the median price moved -2.6% and the number of listings moved +15.6%.

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

839

Lowest Price

£314 GBP

Highest Price

£3,160 GBP

Average Price

£1,087 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

39.7%

Price Spread

59.5%

30-Day Price Trend

-2.6%

30-Day Supply Change

+15.6%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,420/ct

10th Percentile

$953

Median

$1,420

90th Percentile

$2,972

Score Distribution

1.9K diamonds scored across 4 quality tiers

Excellent

331 (17.8%)

Very Good

473 (25.4%)

Good

421 (22.6%)

Average

636 (34.2%)

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Consider Instead

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

J I1I1 inclusions are not visible without magnification

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Lab-Grown J 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