How much does a 3.00 to 4.99ct H SI1 natural oval diamond cost?

As of October 2026, 3.00 to 4.99ct H SI1 natural oval diamonds typically cost £24,446 GBP to £61,009 GBP, with a median price of £34,222 GBP. There are currently 145 diamonds matching this specification available across retailers.

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

About 31% of these diamonds are available at multiple retailers, with an average price spread of 29%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct H SI1 Natural Oval

Quick answer

As of October 2026, there are 145 natural oval diamonds with H colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £24,446 GBP to £61,009 GBP, with a median of £34,222 GBP. At least 60 retailers stock this exact specification, and 31% of the stones appear at more than one of them, with an average price spread of 29%. Half of all listings fall between £7,963 GBP and £10,665 GBP per carat. The same specification in lab grown form lists at a median of about £371 GBP per carat. Over the last 30 days the median price moved +0.4% and the number of listings moved +0.7%.

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

145

Lowest Price

£13,956 GBP

Highest Price

£105,579 GBP

Average Price

£38,618 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

31.0%

Price Spread

28.9%

30-Day Price Trend

+0.4%

30-Day Supply Change

+0.7%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$12,523/ct

10th Percentile

$8,946

Median

$12,523

90th Percentile

$16,272

Score Distribution

446 diamonds scored across 4 quality tiers

Excellent

14 (3.1%)

Very Good

92 (20.6%)

Good

70 (15.7%)

Average

270 (60.5%)

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Consider Instead

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

H SI2SI2 inclusions are not visible without magnification

Save 25%

Lab-Grown H SI1Same specifications, lab-grown origin

Save 95%

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