How much does a 2.00 to 2.99ct J SI1 natural round diamond cost?

As of October 2026, 2.00 to 2.99ct J SI1 natural round diamonds typically cost £5,905 GBP to £16,759 GBP, with a median price of £9,670 GBP. There are currently 803 diamonds matching this specification available across retailers.

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

About 38% of these diamonds are available at multiple retailers, with an average price spread of 44%. A comparison tool like Carat Hunter lets you see all the prices side by side.

2.00 to 2.99ct J SI1 Natural Round

Quick answer

As of October 2026, there are 803 natural round diamonds with J colour and SI1 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run £5,905 GBP to £16,759 GBP, with a median of £9,670 GBP. At least 60 retailers stock this exact specification, and 38% of the stones appear at more than one of them, with an average price spread of 44%. Half of all listings fall between £3,061 GBP and £4,739 GBP per carat. The same specification in lab grown form lists at a median of about £918 GBP per carat. Over the last 30 days the median price moved -2.5% and the number of listings moved +11.8%.

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. 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

803

Lowest Price

£3,468 GBP

Highest Price

£29,856 GBP

Average Price

£10,513 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

38.2%

Price Spread

43.9%

30-Day Price Trend

-2.5%

30-Day Supply Change

+11.8%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$5,087/ct

10th Percentile

$3,302

Median

$5,087

90th Percentile

$7,605

Score Distribution

2.2K diamonds scored across 4 quality tiers

Excellent

221 (9.9%)

Very Good

545 (24.4%)

Good

464 (20.8%)

Average

1,000 (44.8%)

Find Your Diamond

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Consider Instead

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

J SI2SI2 inclusions are not visible without magnification

Save 12%

Lab-Grown J SI1Same specifications, lab-grown origin

Save 76%

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