How much does a 3.00 to 4.99ct H SI2 natural round diamond cost?

As of October 2026, 3.00 to 4.99ct H SI2 natural round diamonds typically cost £13,695 GBP to £45,600 GBP, with a median price of £27,618 GBP. There are currently 496 diamonds matching this specification available across retailers.

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

About 40% of these diamonds are available at multiple retailers, with an average price spread of 45%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct H SI2 Natural Round

Quick answer

As of October 2026, there are 496 natural round diamonds with H colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £13,695 GBP to £45,600 GBP, with a median of £27,618 GBP. At least 53 retailers stock this exact specification, and 40% of the stones appear at more than one of them, with an average price spread of 45%. Half of all listings fall between £5,328 GBP and £8,461 GBP per carat. The same specification in lab grown form lists at a median of about £436 GBP per carat. Over the last 30 days the median price moved -0.9% and the number of listings moved +5.3%.

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

496

Lowest Price

£7,924 GBP

Highest Price

£86,031 GBP

Average Price

£29,086 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

40.2%

Price Spread

44.9%

30-Day Price Trend

-0.9%

30-Day Supply Change

+5.3%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$9,302/ct

10th Percentile

$5,690

Median

$9,302

90th Percentile

$13,325

Score Distribution

1.2K diamonds scored across 4 quality tiers

Excellent

261 (21.6%)

Very Good

318 (26.3%)

Good

228 (18.9%)

Average

402 (33.3%)

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Consider Instead

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

H I1I1 inclusions are not visible without magnification

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Lab-Grown H SI2Same specifications, lab-grown origin

Save 94%

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